refactor(fvp): add CoT desc dtsi

Adding CoT descriptor dtsi file to streamline fvp_tb_fw_config DTB file.

Change-Id: I0bbaef764b100ed0e749ec5f0c78a366398b3519
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
diff --git a/plat/arm/board/fvp/fdts/fvp_cot_desc.dtsi b/plat/arm/board/fvp/fdts/fvp_cot_desc.dtsi
new file mode 100644
index 0000000..9c8328b
--- /dev/null
+++ b/plat/arm/board/fvp/fdts/fvp_cot_desc.dtsi
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2024, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+#if COT_DESC_IN_DTB
+	#if defined(ARM_COT_cca)
+		#include "cca_cot_descriptors.dtsi"
+	#elif defined(ARM_COT_dualroot)
+		#include "dualroot_cot_descriptors.dtsi"
+	#elif defined(ARM_COT_tbbr)
+		#include "tbbr_cot_descriptors.dtsi"
+	#endif
+#endif
diff --git a/plat/arm/board/fvp/fdts/fvp_tb_fw_config.dts b/plat/arm/board/fvp/fdts/fvp_tb_fw_config.dts
index ed60203..b1d3bc1 100644
--- a/plat/arm/board/fvp/fdts/fvp_tb_fw_config.dts
+++ b/plat/arm/board/fvp/fdts/fvp_tb_fw_config.dts
@@ -103,15 +103,7 @@
 #endif /* ARM_BL2_SP_LIST_DTS */
 	};
 
-#if COT_DESC_IN_DTB
-	#if defined(ARM_COT_cca)
-		#include "cca_cot_descriptors.dtsi"
-	#elif defined(ARM_COT_dualroot)
-		#include "dualroot_cot_descriptors.dtsi"
-	#elif defined(ARM_COT_tbbr)
-		#include "tbbr_cot_descriptors.dtsi"
-	#endif
-#endif
+#include "fvp_cot_desc.dtsi"
 
 #if MEASURED_BOOT
 	#include "event_log.dtsi"