set TARGET_CPU_VARIANT to cortex-a15 for arndale

This patch explicitly sets TARGET_CPU_VARIANT to cortex-a15
for the arndale board since Android-4.3 requires it to be
set while compiling.

Change-Id: Ib78d06a20a307b79dcc633dd616240bd88f4427e
Signed-off-by: Pranav Tipnis <pranav.tipnis@linaro.org>
diff --git a/BoardConfig.mk b/BoardConfig.mk
index ac32f00..f3847a9 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -32,6 +32,7 @@
 TARGET_ARCH_VARIANT := armv7-a-neon
 TARGET_CPU_ABI := armeabi-v7a
 TARGET_CPU_ABI2 := armeabi
+TARGET_CPU_VARIANT := cortex-a15
 
 TARGET_USERIMAGES_USE_EXT4 := true
 TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true