drm/msm: use drm_crtc_vblank_waitqueue()

We have drm_crtc_vblank_waitqueue() to get the wait_queue_head_t pointer
for a vblank. Use it instead of poking at dev->vblank[] directly.

Due to the macro maze of wait_event_timeout() that uses the address-of
operator on the argument, we have to pass it in with the indirection
operator.

Cc: Rob Clark <robin.clark@oss.qualcomm.com>
Cc: Dmitry Baryshkov <lumag@kernel.org>
Cc: Abhinav Kumar <abhinav.kumar@linux.dev>
Cc: Jessica Zhang <jesszhan0024@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: Marijn Suijten <marijn.suijten@somainline.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://patch.msgid.link/5917fd537f4a775a1c135a68f294df3917980943.1762513240.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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