ARM: dts: NSP: Specify RAM amount for BCM958625HR board

Add 512MB of memory starting at physical offset 0x6000_0000.

Fixes: 65e9ac208c8e ("ARM: dts: NSP: Add new DT file for bcm958625hr")
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm958625hr.dts

@@ -45,6 +45,10 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	memory {
+		reg = <0x60000000 0x20000000>;
+	};
 };
 
 &nand {