Create a library file for libfdt

TF Makefile was linking all the objects files generated for the
fdt library instead of creating a static library that could be
used in the linking stage.

Change-Id: If3705bba188ec39e1fbf2322a7f2a9a941e1b90d
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 67b574d..d8eda35 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -185,8 +185,7 @@
 
 DYN_CFG_SOURCES		+=	plat/arm/common/arm_dyn_cfg.c		\
 				plat/arm/common/arm_dyn_cfg_helpers.c	\
-				common/fdt_wrappers.c			\
-				${LIBFDT_SRCS}
+				common/fdt_wrappers.c
 
 BL1_SOURCES		+=	${DYN_CFG_SOURCES}
 BL2_SOURCES		+=	${DYN_CFG_SOURCES}