hi4511: use config fragment

Change-Id: Ic6bbff2ff7940c4b2436fb82619543a2a87a08ce
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>
diff --git a/BoardConfig.mk b/BoardConfig.mk
index a1257cb..0d64001 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -35,7 +35,8 @@
 
 TARGET_CPU_SMP := true
 
-KERNEL_CONFIG := hs_android_defconfig
+KERNEL_CONFIG := arch/arm/configs/vexpress.conf \
+                 linaro/configs/android.conf
 TARGET_KERNEL_SOURCE := kernel/linaro/hisilicon/
 BUILD_KERNEL_MODULES := false
 DEVICE_TREES := hi4511:hi4511.dtb