brillcodec: fixed sync problem when processing multi-contexts

brillcodec: fixed sync problem when processing multi-contexts

meta_data queue such as context index, api index and etc.
and codec_data queue which include audio or video input buffer were separated.
In case, video buffer can be deliveried to decode_audio function
because get an element from the meta queue and input queue might be not predictable in the multi-threads.
Two data have to be managed by one queue.

Change-Id: I9a140e2c333042786d10530210b0028823a74c2c
Signed-off-by: Kitae Kim <kt920.kim@samsung.com>