media: ipu3-cio2: Call cio2_bridge_init() before anything else

Since cio2_bridge_init() may now return -EPROBE_DEFER it is best to
call it before anything else.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>