CHROMIUM: v4l: Add VP8 low-level decoder API controls.

CHROMIUM: v4l: Add VP8 low-level decoder API controls.

These controls are to be used with the new low-level decoder API for VP8
to provide additional parameters for the hardware that cannot parse the
input stream.

BUG=chrome-os-partner:33728
TEST=compile

Signed-off-by: Pawel Osciak <posciak@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/237670
Reviewed-by: Wu-cheng Li <wuchengli@chromium.org>
Commit-Queue: Tomasz Figa <tfiga@chromium.org>
Tested-by: Tomasz Figa <tfiga@chromium.org>
Change-Id: I32b45e07cfe02b25ea5202d0c839699103e3b800
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>