ARM: dts: hisilicon: fix errors detected by root-node.yaml

Make the memory node name match the regex "^memory(@[0-9a-f]+)?$" which
is described in memory.yaml. Otherwise, it will be treated as root node,
and misreported by root-node.yaml.

Errors misreported by root-node.yaml:
/: memory: False schema does not allow {'device_type': ['memory'], 'reg':

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm/boot/dts/hi3519-demb.dts

@@ -14,7 +14,7 @@
 		serial0 = &uart0;
 	};
 
-	memory {
+	memory@80000000 {
 		device_type = "memory";
 		reg = <0x80000000 0x40000000>;
 	};

arch/arm/boot/dts/hi3620-hi4511.dts

@@ -17,7 +17,7 @@
 		stdout-path = "serial0:115200n8";
 	};
 
-	memory {
+	memory@40000000 {
 		device_type = "memory";
 		reg = <0x40000000 0x20000000>;
 	};

arch/arm/boot/dts/hip01-ca9x2.dts

@@ -37,7 +37,7 @@
 		};
 	};
 
-	memory {
+	memory@80000000 {
 		device_type = "memory";
 		reg = <0x80000000 0x80000000>;
 	};

arch/arm/boot/dts/hisi-x5hd2-dkb.dts

@@ -35,7 +35,7 @@
 		};
 	};
 
-	memory {
+	memory@0 {
 		device_type = "memory";
 		reg = <0x00000000 0x80000000>;
 	};