v4l2_codec2: Remove image processor and JPEG support from V4L2 device.

This CL removes leftover code related to image processor support and
JPEG encoding/decoding from the V4L2 device, as it's currently not
used.

Bug: 155138142
Test: arc.VideoEncodeAccel.h264_192p_i420_vm
Change-Id: I34fe7819e78b93a9a9d33e4888e56aba5f9826cb