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/rockchip/rk3368/platform.mk b/plat/rockchip/rk3368/platform.mk
index ad204e9..7ecb21a 100644
--- a/plat/rockchip/rk3368/platform.mk
+++ b/plat/rockchip/rk3368/platform.mk
@@ -57,3 +57,5 @@
 
 # Do not enable SVE
 ENABLE_SVE_FOR_NS	:=	0
+
+WORKAROUND_CVE_2017_5715	:=	0