ARM: shmobile: bockw: tidyup DT node naming

According to ePAPR spec,
this patch tidies up DT node name.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7778-bockw-reference.dts

@@ -71,7 +71,7 @@ &pfc {
 	pinctrl-0 = <&scif0_pins>;
 	pinctrl-names = "default";
 
-	scif0_pins: scif0 {
+	scif0_pins: serial0 {
 		renesas,groups = "scif0_data_a", "scif0_ctrl";
 		renesas,function = "scif0";
 	};
@@ -81,7 +81,7 @@ mmc_pins: mmc {
 		renesas,function = "mmc";
 	};
 
-	sdhi0_pins: sdhi0 {
+	sdhi0_pins: sd0 {
 		renesas,groups = "sdhi0_data4", "sdhi0_ctrl",
 				  "sdhi0_cd", "sdhi0_wp";
 		renesas,function = "sdhi0";