ffa: Add spm-test4 test SP

Spm-test4 is used to test multiple SPs with the same uuid. It uses a
different UUID for it's binary then them the one being used in its
FF-A manifest.

Signed-off-by: Jelle Sels <jelle.sels@arm.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/fvp/spmc_manifest.dts b/fvp/spmc_manifest.dts
index 6b18459..bd959a6 100644
--- a/fvp/spmc_manifest.dts
+++ b/fvp/spmc_manifest.dts
@@ -85,6 +85,11 @@
 			load-address = <0x0 0x7a20000>;
 		};
 
+		test_sp4 {
+			/* SP binary UUID */
+			uuid = <0xed623742 0x6f407277 0x270cd899 0xf8bb0ada>;
+			load-address = <0x0 0x7a30000>;
+		};
 #endif
 
 	};