spm: Normalize the style of spm core manifest

Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
Change-Id: Ib39e53eb53521b8651fb30b7bf0058f7669569d5

plat/arm/board/fvp/fdts/fvp_spmc_manifest.dts

@@ -27,12 +27,12 @@
 		vm1 {
 			is_spci_partition;
 			debug_name = "cactus-primary";
-			load-addr = <0x7000000>;
+			load_address = <0x7000000>;
 		};
 		vm2 {
 			is_spci_partition;
 			debug_name = "cactus-secondary";
-			load-addr = <0x7100000>;
+			load_address = <0x7100000>;
 			vcpu_count = <2>;
 			mem_size = <1048576>;
 		};