ARM: dts: sun7i: Use most-qualified system control compatibles

This switches the sun7i-a20 dtsi to use the most qualified compatibles
for the system-control block (previously named SRAM controller) as well
as the SRAM blocks. The sun4i-a10 compatibles are kept since these
hardware blocks are backward-compatible.

The node name for system control is also updated to reflect the fact that
the controller described is really about system control rather than SRAM
control.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -252,8 +252,9 @@ soc@1c00000 {
 		#size-cells = <1>;
 		ranges;
 
-		sram-controller@1c00000 {
-			compatible = "allwinner,sun4i-a10-sram-controller";
+		system-control@1c00000 {
+			compatible = "allwinner,sun7i-a20-system-control",
+				     "allwinner,sun4i-a10-system-control";
 			reg = <0x01c00000 0x30>;
 			#address-cells = <1>;
 			#size-cells = <1>;
@@ -267,7 +268,8 @@ sram_a: sram@0 {
 				ranges = <0 0x00000000 0xc000>;
 
 				emac_sram: sram-section@8000 {
-					compatible = "allwinner,sun4i-a10-sram-a3-a4";
+					compatible = "allwinner,sun7i-a20-sram-a3-a4",
+						     "allwinner,sun4i-a10-sram-a3-a4";
 					reg = <0x8000 0x4000>;
 					status = "disabled";
 				};
@@ -281,7 +283,8 @@ sram_d: sram@10000 {
 				ranges = <0 0x00010000 0x1000>;
 
 				otg_sram: sram-section@0 {
-					compatible = "allwinner,sun4i-a10-sram-d";
+					compatible = "allwinner,sun7i-a20-sram-d",
+						     "allwinner,sun4i-a10-sram-d";
 					reg = <0x0000 0x1000>;
 					status = "disabled";
 				};