Disable workaround for CVE-2017-5715 on unaffected platforms

Change-Id: Ib67b841ab621ca1ace3280e44cf3e1d83052cb73
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
diff --git a/plat/hisilicon/hikey/platform.mk b/plat/hisilicon/hikey/platform.mk
index c8a2992..b11d208 100644
--- a/plat/hisilicon/hikey/platform.mk
+++ b/plat/hisilicon/hikey/platform.mk
@@ -122,4 +122,6 @@
 ERRATA_A53_843419		:=	1
 ERRATA_A53_855873		:=	1
 
+WORKAROUND_CVE_2017_5715	:=	0
+
 FIP_ALIGN			:=	512