drm/msm/dpu: Add mutex lock in control vblank irq

stable inclusion
from stable-v6.7.4
commit 14f109bf74dd67e1d0469fed859c8e506b0df53f
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I96GNY
CVE: CVE-2023-52586

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.7.y&id=14f109bf74dd67e1d0469fed859c8e506b0df53f



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[ Upstream commit 45284ff733e4caf6c118aae5131eb7e7cf3eea5a ]

Add a mutex lock to control vblank irq to synchronize vblank
enable/disable operations happening from different threads to prevent
race conditions while registering/unregistering the vblank irq callback.

v4: -Removed vblank_ctl_lock from dpu_encoder_virt, so it is only a
    parameter of dpu_encoder_phys.
    -Switch from atomic refcnt to a simple int counter as mutex has
    now been added
v3: Mistakenly did not change wording in last version. It is done now.
v2: Slightly changed wording of commit message

Signed-off-by: Paloma Arellano <quic_parellan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/571854/
Link: https://lore.kernel.org/r/20231212231101.9240-2-quic_parellan@quicinc.com


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Cheng Yu <serein.chengyu@huawei.com>