arm64: dts: mt8173: fix mdp aliases property name

Fix warning:
Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Link: https://lore.kernel.org/r/20200414030815.192104-1-hsinyi@chromium.orgSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8173.dtsi

@@ -43,14 +43,14 @@ aliases {
 		dpi0 = &dpi0;
 		dsi0 = &dsi0;
 		dsi1 = &dsi1;
-		mdp_rdma0 = &mdp_rdma0;
-		mdp_rdma1 = &mdp_rdma1;
-		mdp_rsz0 = &mdp_rsz0;
-		mdp_rsz1 = &mdp_rsz1;
-		mdp_rsz2 = &mdp_rsz2;
-		mdp_wdma0 = &mdp_wdma0;
-		mdp_wrot0 = &mdp_wrot0;
-		mdp_wrot1 = &mdp_wrot1;
+		mdp-rdma0 = &mdp_rdma0;
+		mdp-rdma1 = &mdp_rdma1;
+		mdp-rsz0 = &mdp_rsz0;
+		mdp-rsz1 = &mdp_rsz1;
+		mdp-rsz2 = &mdp_rsz2;
+		mdp-wdma0 = &mdp_wdma0;
+		mdp-wrot0 = &mdp_wrot0;
+		mdp-wrot1 = &mdp_wrot1;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		serial2 = &uart2;