set CPU_VARIANT to A9 explicitly for 4.3

Change-Id: I86fd1b3add5319b8dbc2fbe85457c969fcf38b24
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>
diff --git a/BoardConfig.mk b/BoardConfig.mk
index bc7595b..cbae32e 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -25,6 +25,7 @@
 
 TARGET_CPU_ABI := armeabi-v7a
 TARGET_CPU_ABI2 := armeabi
+TARGET_CPU_VARIANT := cortex-a9
 
 TARGET_ARCH := arm
 # Enable NEON feature