msm: vidc: Add support for DIVX 4/5/6

Add support to the driver to properly configure the Venus core for
various DIVX formats.

Change-Id: Ica6411936a09edfc3aa4ca321c781ff22948742a
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
[davidb: only videodev2.h]
Signed-off-by: David Brown <davidb@codeaurora.org>