drm/arm/malidp: Switch to drm_atomic_get_new_crtc_state()

The malidp atomic_check implementation uses the deprecated
drm_atomic_get_existing_crtc_state() helper.

This hook is called as part of the global atomic_check, thus before the
states are swapped. The existing state thus points to the new state, and
we can use drm_atomic_get_new_crtc_state() instead.

Reviewed-by: Liviu Dudau <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/arm/malidp_planes.c

···
 				   struct drm_plane_state *state)
 {
 	struct drm_crtc_state *crtc_state =
-		drm_atomic_get_existing_crtc_state(state->state, state->crtc);
+		drm_atomic_get_new_crtc_state(state->state, state->crtc);
 	struct malidp_crtc_state *mc;
 	u32 src_w, src_h;
 	int ret;