fix(a5ds): add default value for ARM_DISABLE_TRUSTED_WDOG

With introduction of check on boolean flags, it should be ensured that
each boolean flag has default value provided by platform.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ia92c3dded842e14099b4a7667569605d7066a8f9
diff --git a/plat/arm/board/a5ds/platform.mk b/plat/arm/board/a5ds/platform.mk
index 4f87306..6fcf080 100644
--- a/plat/arm/board/a5ds/platform.mk
+++ b/plat/arm/board/a5ds/platform.mk
@@ -100,6 +100,8 @@
 
 MULTI_CONSOLE_API		:=	1
 
+ARM_DISABLE_TRUSTED_WDOG	:=	1
+
 PLAT_BL_COMMON_SOURCES	+=	lib/xlat_tables/aarch32/nonlpae_tables.c
 
 # Use translation tables library v1 when using Cortex-A5