ARM: dts: aspeed-g5: Use recommended generic node name for SDMC

The EDAC is a sub-function of the SDRAM Memory Controller. Rename the
node to the appropriate generic node name.

Cc: Stefan M Schaeckeler <sschaeck@cisco.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Stefan Schaeckeler <sschaeck@cisco.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-g5.dtsi

@@ -206,7 +206,7 @@ apb {
 			#size-cells = <1>;
 			ranges;
 
-			edac: sdram@1e6e0000 {
+			edac: memory-controller@1e6e0000 {
 				compatible = "aspeed,ast2500-sdram-edac";
 				reg = <0x1e6e0000 0x174>;
 				interrupts = <0>;