media: i2c: tc358746: make DEFINE_RUNTIME_DEV_PM_OPS static

DEFINE_RUNTIME_DEV_PM_OPS should be static.

This fixes this sparse warning:

drivers/media/i2c/tc358746.c:1671:1: warning: symbol 'tc358746_pm_ops' was not declared. Should it be static?

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>