arm64: allwinner: a64: Fix node with unit name and no reg property

This patch fix the warning "xxx has a unit name, but no reg property" by
removing "@0" from such node
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi

@@ -335,7 +335,7 @@ spi1_pins: spi1 {
 				function = "spi1";
 			};
 
-			uart0_pins_a: uart0@0 {
+			uart0_pins_a: uart0 {
 				pins = "PB8", "PB9";
 				function = "uart0";
 			};
@@ -538,7 +538,7 @@ r_pio: pinctrl@1f02c00 {
 			interrupt-controller;
 			#interrupt-cells = <3>;
 
-			r_rsb_pins: rsb@0 {
+			r_rsb_pins: rsb {
 				pins = "PL0", "PL1";
 				function = "s_rsb";
 			};