media: ipu3-cio2: Use v4l2_get_link_freq helper

Use v4l2_get_link_freq helper and add support for sensor drivers
implementing only V4L2_CID_PIXEL_RATE.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
1 file changed