msm: camera: Add support for YUV422 formats

Adding support for YUV422 pixel formats for ISP output.
This formats will be only supported by the RDI dump, for sensor which
outputs this kind of formats.

Change-Id: I45db56c3efa69fb4f70a551fe33cec42190df987
Signed-off-by: Vladislav Hristov <vhrist@codeaurora.org>