msm: vidc: Keep video formats instance specific

Existing video driver maintains a static array
of video formats. Video instances have a pointer
to the nodes of that static array. For cases, when
there are multiple video instances, different video
instance has the same pointer to the video formats.
It happens that one video instance may configure
the format differently and may impact the other
concurrent video instance.
To avoid such situation, it is ideal to keep
video formats specific to the instance.

Change-Id: I9bd487459277e509cf64c0124a2d2e3f5fdc443b
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>