powerpc: wii: Add unit address to /memory

This fixes the following dtschema warning:

  arch/powerpc/boot/dts/wii.dtb: /: memory: False schema does not allow
  {'device_type': ['memory'], 'reg': [[0, 25165824], [268435456, 67108864]]}

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260311-wii-schema-v1-1-1563ac4aefa8@posteo.net

Author: neuschaefer

arch/powerpc/boot/dts/wii.dts

@@ -29,7 +29,7 @@
 		bootargs = "root=/dev/mmcblk0p2 rootwait udbg-immortal";
 	};
 
-	memory {
+	memory@0 {
 		device_type = "memory";
 		reg = <0x00000000 0x01800000	/* MEM1 24MB 1T-SRAM */
 		       0x10000000 0x04000000>;	/* MEM2 64MB GDDR3 */