(feat)n1sdp: add support for OP-TEE SPMC

These changes are to add support for loading and booting
OP-TEE as SPMC running at SEL1 for N1SDP platform.

Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
Change-Id: I0514db646d4868b6f0c56f1ea60495cb3f7364fd
diff --git a/plat/arm/board/n1sdp/fdts/n1sdp_fw_config.dts b/plat/arm/board/n1sdp/fdts/n1sdp_fw_config.dts
index f61e30b..700b900 100644
--- a/plat/arm/board/n1sdp/fdts/n1sdp_fw_config.dts
+++ b/plat/arm/board/n1sdp/fdts/n1sdp_fw_config.dts
@@ -15,7 +15,11 @@
 			max-size = <0x200>;
 			id = <TB_FW_CONFIG_ID>;
 		};
-
+		tos_fw-config {
+			load-address = <0x0 0x4001600>;
+			max-size = <0x1000>;
+			id = <TOS_FW_CONFIG_ID>;
+		};
 		nt_fw-config {
 			load-address = <0x0 0xFEF00000>;
 			max-size = <0x0100000>;