media: venus: vdec: Handle DRC after drain

stable inclusion
from stable-v5.10.180
commit 3a227dc12b1af9cdca12da9ce486606138ee33b0
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8DDFN

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3a227dc12b1af9cdca12da9ce486606138ee33b0



--------------------------------

[ Upstream commit c8e8dabc ]

If the DRC is near the end of the stream the client
may send a V4L2_DEC_CMD_STOP before the DRC occurs.
V4L2_DEC_CMD_STOP puts the driver into the
VENUS_DEC_STATE_DRAIN state.  DRC must be aware so
that after the DRC event the state can be restored
correctly.

Signed-off-by: Fritz Koenig <frkoenig@chromium.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Stable-dep-of: 50248ad9 ("media: venus: dec: Fix handling of the start cmd")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>