drm/msm/dpu: correct dpu_plane_virtual_atomic_check()

drm/msm/dpu: correct dpu_plane_virtual_atomic_check()

Fix c&p error in dpu_plane_virtual_atomic_check(), compare CRTC width
too, in addition to CRTC height.

Fixes: 8c62a31607f6 ("drm/msm/dpu: allow using two SSPP blocks for a single plane")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202507150432.U0cALR6W-lkp@intel.com/
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Jessica Zhang <jessica.zhang@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/664170/
Link: https://lore.kernel.org/r/20250715-msm-fix-virt-atomic-check-v1-1-9bab02c9f952@oss.qualcomm.com