feat(spm): change UART0-1 to NS device region

To enable device memory sharing test make memory region for UART0
and 1 a NS device region so that it can be shared by tf-a-tests
to the cactus SP.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: Iadfe02a65f5d4a8b60296f07c4943dd31f201453

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

@@ -99,12 +99,17 @@
 
 	memory@2 {
 		device_type = "device-memory";
-		reg = <0x0 0x1c090000 0x0 0x40000>, /* UART */
+		reg = <0x0 0x1c0b0000 0x0 0x20000>, /* UART 2-3 */
 		      <0x0 0x2bfe0000 0x0 0x20000>, /* SMMUv3TestEngine */
 		      <0x0 0x2a490000 0x0 0x20000>, /* SP805 Trusted Watchdog */
 		      <0x0 0x1c130000 0x0 0x10000>; /* Virtio block device */
 	};
 
+	memory@3 {
+		device_type = "ns-device-memory";
+		reg = <0x0 0x1c090000 0x0 0x20000>; /* UART 0-1 */
+	};
+
 
 #if MEASURED_BOOT
 #include "event_log.dtsi"