zenfone8: Enable updatable APEX

Change-Id: I2db66010d2eb7f73be6dcc06b75aa0187eecd27f
diff --git a/device.mk b/device.mk
index 1f5809f..6406afa 100755
--- a/device.mk
+++ b/device.mk
@@ -27,6 +27,9 @@
 # Include GSI keys
 $(call inherit-product, $(SRC_TARGET_DIR)/product/gsi_keys.mk)
 
+# Enable updating of APEXes
+$(call inherit-product, $(SRC_TARGET_DIR)/product/updatable_apex.mk)
+
 # Overlays
 DEVICE_PACKAGE_OVERLAYS += \
     $(LOCAL_PATH)/overlay \