msm: vidc: update input tag implementation

In qbuf (input) store input_tag to etb_data list and send it to
firmware in etb. Firmware will return input_tag in ftb_done,
store it in fbd_data list and return the same when client does
dqbuf (output).

Change-Id: I3589e5a3017cac49000fc64191f9f756bc4011f4
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>