LoongArch: Fix build warnings about export.h

After commit a934a57a42 ("scripts/misc-check: check missing #include
<linux/export.h> when W=1") and 7d95680d64 ("scripts/misc-check:
check unnecessary #include <linux/export.h> when W=1"), we get some build
warnings with W=1:

arch/loongarch/kernel/acpi.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/alternative.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/kfpu.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/traps.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/unwind_guess.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/unwind_orc.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/unwind_prologue.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/lib/crc32-loongarch.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/lib/csum.c: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing
arch/loongarch/kernel/elf.c: warning: EXPORT_SYMBOL() is not used, but #include <linux/export.h> is present
arch/loongarch/kernel/paravirt.c: warning: EXPORT_SYMBOL() is not used, but #include <linux/export.h> is present
arch/loongarch/pci/pci.c: warning: EXPORT_SYMBOL() is not used, but #include <linux/export.h> is present

So fix these build warnings for LoongArch.

Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/kernel/acpi.c

@@ -10,6 +10,7 @@
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/efi-bgrt.h>
+#include <linux/export.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/memblock.h>

arch/loongarch/kernel/alternative.c

@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#include <linux/export.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <asm/alternative.h>

arch/loongarch/kernel/elf.c

@@ -6,7 +6,6 @@
 
 #include <linux/binfmts.h>
 #include <linux/elf.h>
-#include <linux/export.h>
 #include <linux/sched.h>
 
 #include <asm/cpu-features.h>

arch/loongarch/kernel/kfpu.c

@@ -4,6 +4,7 @@
  */
 
 #include <linux/cpu.h>
+#include <linux/export.h>
 #include <linux/init.h>
 #include <asm/fpu.h>
 #include <asm/smp.h>

arch/loongarch/kernel/paravirt.c

@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <linux/export.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/irq_work.h>

arch/loongarch/kernel/traps.c

@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/kexec.h>
 #include <linux/module.h>
+#include <linux/export.h>
 #include <linux/extable.h>
 #include <linux/mm.h>
 #include <linux/sched/mm.h>

arch/loongarch/kernel/unwind_guess.c

@@ -3,6 +3,7 @@
  * Copyright (C) 2022 Loongson Technology Corporation Limited
  */
 #include <asm/unwind.h>
+#include <linux/export.h>
 
 unsigned long unwind_get_return_address(struct unwind_state *state)
 {

arch/loongarch/kernel/unwind_orc.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
-#include <linux/objtool.h>
+#include <linux/export.h>
 #include <linux/module.h>
+#include <linux/objtool.h>
 #include <linux/sort.h>
 #include <asm/exception.h>
 #include <asm/orc_header.h>

arch/loongarch/kernel/unwind_prologue.c

@@ -3,6 +3,7 @@
  * Copyright (C) 2022 Loongson Technology Corporation Limited
  */
 #include <linux/cpumask.h>
+#include <linux/export.h>
 #include <linux/ftrace.h>
 #include <linux/kallsyms.h>
 

arch/loongarch/lib/crc32-loongarch.c

@@ -11,6 +11,7 @@
 
 #include <asm/cpu-features.h>
 #include <linux/crc32.h>
+#include <linux/export.h>
 #include <linux/module.h>
 #include <linux/unaligned.h>
 

arch/loongarch/lib/csum.c

@@ -2,6 +2,7 @@
 // Copyright (C) 2019-2020 Arm Ltd.
 
 #include <linux/compiler.h>
+#include <linux/export.h>
 #include <linux/kasan-checks.h>
 #include <linux/kernel.h>
 

arch/loongarch/pci/pci.c

@@ -3,7 +3,6 @@
  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  */
 #include <linux/kernel.h>
-#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/types.h>