drm/amd/display: Remove flag check in mpcc update

[Why]
MPCC programming was being missed during certain split pipe enables due
to full_update flag not being true. This caused a momentary flash on
half the screen. After discussion, determined we should not have that
flag check within update_mpcc, as it should always perform full
programming when called.

[How]
Remove flag check. We call update_blending within insert_plane, so we
do not need to replace its call from the if block.
Signed-off-by: Noah Abradjian <noah.abradjian@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -2158,12 +2158,6 @@ void dcn20_update_mpcc(struct dc *dc, struct pipe_ctx *pipe_ctx)
 	 */
 	mpcc_id = hubp->inst;
 
-	/* If there is no full update, don't need to touch MPC tree*/
-	if (!pipe_ctx->plane_state->update_flags.bits.full_update) {
-		mpc->funcs->update_blending(mpc, &blnd_cfg, mpcc_id);
-		return;
-	}
-
 	/* check if this MPCC is already being used */
 	new_mpcc = mpc->funcs->get_mpcc_for_dpp(mpc_tree_params, mpcc_id);
 	/* remove MPCC if being used */