regulator: Remove duplicated include in mt6359-regulator.c

./drivers/regulator/mt6359-regulator.c: linux/platform_device.h is included more than once.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5901


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230718003255.124594-1-yang.lee@linux.alibaba.com


Signed-off-by: Mark Brown <broonie@kernel.org>