media: s5p-mfc: Fix in register read and write for H264

stable inclusion
from stable-v5.10.163
commit c0a3d2158437ae4ad0737f1bf052d0ee18fcd52d
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7PJ9N

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c0a3d2158437ae4ad0737f1bf052d0ee18fcd52d



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[ Upstream commit 06710cd5 ]

Few of the H264 encoder registers written were not getting reflected
since the read values were not stored and getting overwritten.

Fixes: 6a9c6f68 ("[media] s5p-mfc: Add variants to access mfc registers")

Cc: stable@vger.kernel.org
Cc: linux-fsd@tesla.com
Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: zhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>