feat(morello): add DTS for Morello SoC platform

Added Morello SoC specific DTS file.

Change-Id: I099e74ec95ed9e1b47f7d5a68b0dd1e251439e11
Signed-off-by: Manoj Kumar <manoj.kumar3@arm.com>
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
diff --git a/plat/arm/board/morello/platform.mk b/plat/arm/board/morello/platform.mk
index 39803bb..e09405c 100644
--- a/plat/arm/board/morello/platform.mk
+++ b/plat/arm/board/morello/platform.mk
@@ -38,7 +38,7 @@
 				${MORELLO_BASE}/morello_security.c	\
 				drivers/arm/css/sds/sds.c
 
-FDT_SOURCES		+=	fdts/morello-fvp.dts
+FDT_SOURCES		+=	fdts/morello-${TARGET_PLATFORM}.dts
 
 # TF-A not required to load the SCP Images
 override CSS_LOAD_SCP_IMAGES		:=	0