drm/msm/mdp4: convert to drm_crtc_handle_vblank()

Stop using deprecated drm_handle_vblank(), use drm_crtc_handle_vblank()
instead.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/490110/
Link: https://lore.kernel.org/r/20220617233328.1143665-3-dmitry.baryshkov@linaro.org


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>