media: ipu3-cio2: Validate mbus format in setting subdev format

Validate media bus code, width and height when setting the subdev format.

This effectively reworks how setting subdev format is implemented in the
driver.

Fixes: c2a6a07a

 ("media: intel-ipu3: cio2: add new MIPI-CSI2 driver")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: stable@vger.kernel.org # v4.16 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>