msm: vidc: Add support to config nal size for encoder

Parse nal video stream format supported capabilities
from sys init done msg packet and update in session
capabilities.

Add interface to query and configure nal size by
clients using V4L2_CID_MPEG_VIDC_VIDEO_STREAM_FORMAT
control.

Change-Id: I3300139bf4d2ea16e8bdf294e55b0032a37073d6
Signed-off-by: Zhongbo Shi <zhongbos@codeaurora.org>