tuna: cmhw: add support for third-party kernel

Color & Gamma can be adjusted now on non-stock kernels.
Tested on maguro with Fancy, Franco & Mpokang kernel.

Change-Id: I398d29456fa15a67c1f4095eaf246ccea9e9f8d3
Signed-off-by: Lorenzo M <djmesias@yahoo.es>
tuna: Enable use of FFMPEG codecs for extended formats