msm: vidc: query tz for dynamic buffer feature support

Query TZ before returning to video hal whether dynamic buffer
mode is supported or not for secure playback.

Change-Id: I77744807524f5d6a4a1e45ea12719c5d4fd6df39
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
Signed-off-by: Shalaj Jain <shalajj@codeaurora.org>