dt-bindings: Drop Li Yang as maintainer for all bindings

Remove Li Yang from all device tree bindings because mails to this
address are bouncing.

Commit fbdd90334a ("MAINTAINERS: Drop Li Yang as their email address
stopped working") already removed the entry from the MAINTAINERS but
didn't address all the in-file entries of the device tree bindings.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -8,7 +8,6 @@ title: Freescale i.MX Platforms
 
 maintainers:
   - Shawn Guo <shawnguo@kernel.org>
-  - Li Yang <leoyang.li@nxp.com>
 
 properties:
   $nodename:

Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.yaml

@@ -8,7 +8,6 @@ title: Freescale Layerscape External Interrupt Controller
 
 maintainers:
   - Shawn Guo <shawnguo@kernel.org>
-  - Li Yang <leoyang.li@nxp.com>
 
 description: |
   Some Layerscape SOCs (LS1021A, LS1043A, LS1046A LS1088A, LS208xA,

Documentation/devicetree/bindings/soc/fsl/fsl,layerscape-dcfg.yaml

@@ -8,7 +8,6 @@ title: Freescale Layerscape Device Configuration Unit
 
 maintainers:
   - Shawn Guo <shawnguo@kernel.org>
-  - Li Yang <leoyang.li@nxp.com>
 
 description: |
   DCFG is the device configuration unit, that provides general purpose

Documentation/devicetree/bindings/soc/fsl/fsl,layerscape-scfg.yaml

@@ -8,7 +8,6 @@ title: Freescale Layerscape Supplemental Configuration Unit
 
 maintainers:
   - Shawn Guo <shawnguo@kernel.org>
-  - Li Yang <leoyang.li@nxp.com>
 
 description: |
   SCFG is the supplemental configuration unit, that provides SoC specific