[media] msm: vidc: Add H.264 MVC layout control and codec enum

H.264 MVC buffer layout control specifies how the output is generated
(by decoder) or expected (by encoder). The codec enum adds legacy
enumeration used by some clients.

Change-Id: Iee48db23e1edcf26b8fc7b72ff1b8b205bd02c95
Signed-off-by: Jorge Solano Altamirano <jsolano@codeaurora.org>