disp: msm: sde: mark LTM as dirty when dest-scaler is updated

Mark LTM as dirty when dest-scaler is updated so it matches with
the mixer configuration.

Change-Id: I5f2b166ec5eb0bafc4c75f8b3268c3e85c558191
Signed-off-by: Steve Cohen <cohens@codeaurora.org>

msm/sde/sde_crtc.c

@@ -2164,6 +2164,8 @@ static void _sde_crtc_dest_scaler_setup(struct drm_crtc *crtc)
 				hw_ctl->ops.update_bitmask_mixer(
 						hw_ctl, hw_lm->idx, 1);
 		}
+
+		sde_cp_mode_switch_prop_dirty(crtc);
 	}
 }