msm: vidc: add MVC to the list of supported decoders

System init returns the list of supported codecs but does not
consider MVC as an independent codec, the driver in the other hand
considers MVC as an independent codec and not as part of H.264
codec. The mapping from MVC to H.264 is done at HAL level, the
system init callback data comes directly from firmware/codec
without any translation/mapping done, because of this is necessary
to add MVC to the list of supported codecs if H.264 support exist.
This is valid only for Venus core.

Change-Id: I1a0637aceaf40aef402f7372eb2b38031421c3cf
Signed-off-by: Jorge Solano Altamirano <jsolano@codeaurora.org>