msm: vidc: Increase input buffer size

Current input buffer size is sufficient for 8bit frame size
and not sufficient for 10bit frame size and hence increase
size to accommodate 10bit frames to resolve video playback
failures observed with few 10bit contents.

Change-Id: Ieb3cb73ce1ed5f326fc7273f73410b23f32be87b
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>