As RZ/G2L uses the ARM Architected Timer as system timer, enabling
the OSTM is not mandatory.
Make RENESAS_OSTM symbol visible, so that user can enable it
when needed.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211112184413.4391-5-biju.das.jz@bp.renesas.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>