vexpress: Set TARGET_ARCH := arm explicitly

This is needed for 4.2, and doesn't break older versions.

Change-Id: I3564a1c349a797225c010ca1f5f67aa5e08863db
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 3af9177..8d0bf13 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -49,6 +49,7 @@
 TARGET_CPU_ABI := armeabi-v7a
 TARGET_CPU_ABI2 := armeabi
 
+TARGET_ARCH := arm
 # Enable NEON feature
 TARGET_ARCH_VARIANT := armv7-a-neon
 ARCH_ARM_HAVE_TLS_REGISTER := true
@@ -75,4 +76,4 @@
 # Build uImage and uInitrd instead of kernel and ramdisk.img
 TARGET_BOOTLOADER_TYPE := uboot
 endif
-endif
\ No newline at end of file
+endif