CHROMIUM: [media] rk3288_vpu: implement vp8d hw config part

CHROMIUM: [media] rk3288_vpu: implement vp8d hw config part

This patch adds code implementing rk3288_vpu_codec_ops
for VP8 decoder.

BUG=chrome-os-partner:33728
TEST=video_encode_accelerator_unittest;video_decode_accelerator_unittest

Signed-off-by: ZhiChao Yu <zhichao.yu@rock-chips.com>
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/238311
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Change-Id: I7875c3c6e53ed00ea74035778651b6b676298ee8
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>