vc04_services: bcm2835-codec: Add support for V4L2_PIX_FMT_NV12_COL128

V4L2_PIX_FMT_NV12_COL128 is supported by the ISP and the input of
video_encode, output of video_decode, and both input and output
of the ISP.

Add in the plumbing to support the format on those ports.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>