UPSTREAM: radeon/vce: Limiting max supported refernce frames to 1 for h264 encoding

VCE currently restricted  max_supported reference frames to 1

BUG=b:177182744
TEST=tast run <dut_ip> video.PlatformEncoding.vaapi_h264_180

Signed-off-by: shanshengwang <shansheng.wang@amd.corp-partner.google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13543>
(cherry picked from commit 4f4164d62a0b29c12d750d9467e73c31e7f678b8)
Change-Id: I80a4617fcd1e78c845fcc40057f41c79c1a0c9b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mesa/+/3251125
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Suresh Guttula <suresh.guttula@amd.corp-partner.google.com>
Reviewed-by: Drew Davenport <ddavenport@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Tested-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
1 file changed