ARM: dts: sun6i: Add default address and size cells for SPI

The SPI controller bindings require an address cell size of 1, and a size
cell size of 0. Let's put it at the DTSI level to make sure that's properly
enforced.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun6i-a31.dtsi

@@ -987,6 +987,8 @@ spi0: spi@1c68000 {
 			dma-names = "rx", "tx";
 			resets = <&ccu RST_AHB1_SPI0>;
 			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
 		};
 
 		spi1: spi@1c69000 {
@@ -999,6 +1001,8 @@ spi1: spi@1c69000 {
 			dma-names = "rx", "tx";
 			resets = <&ccu RST_AHB1_SPI1>;
 			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
 		};
 
 		spi2: spi@1c6a000 {
@@ -1011,6 +1015,8 @@ spi2: spi@1c6a000 {
 			dma-names = "rx", "tx";
 			resets = <&ccu RST_AHB1_SPI2>;
 			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
 		};
 
 		spi3: spi@1c6b000 {
@@ -1023,6 +1029,8 @@ spi3: spi@1c6b000 {
 			dma-names = "rx", "tx";
 			resets = <&ccu RST_AHB1_SPI3>;
 			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
 		};
 
 		gic: interrupt-controller@1c81000 {