CHROMIUM: [media] rk3288-vpu: Add V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME

CHROMIUM: [media] rk3288-vpu: Add V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME

Also remove unused V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE.

BUG=chrome-os-partner:53551
TEST=Passed vea test cases.
CQ-DEPEND=CL:346361

Signed-off-by: Heng-Ruey Hsu <henryhsu@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/346390
Commit-Ready: Heng-ruey Hsu <henryhsu@chromium.org>
Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Wu-cheng Li <wuchengli@chromium.org>
Change-Id: I6ad197191e57de9233d201d8196b3edb4df7e560
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>