hikey/hikey960: Fix APEX related crashloop

Fixes "apexd: This device does not support updatable APEX. Exiting"
crash loop.

Change-Id: I145567d170a0e0df235e0a06ca381f97bd96b4f8
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/device-common.mk b/device-common.mk
index 0c8c457..2d245a2 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -14,6 +14,10 @@
 # limitations under the License.
 #
 
+# Enable updating of APEXes
+$(call inherit-product, $(SRC_TARGET_DIR)/product/updatable_apex.mk)
+
+
 ifneq (,$(filter $(TARGET_PRODUCT),hikey960_tv hikey_tv))
 # Setup TV Build
 USE_OEM_TV_APP := true