zenfone6: Enabled updateable APEX

Change-Id: Iae46cbf48ae5fbfa100e83e8d6ce19f225102cf3
diff --git a/BoardConfig.mk b/BoardConfig.mk
index d65051c..820e110 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -57,6 +57,9 @@
 # Api
 #PRODUCT_SHIPPING_API_LEVEL := 28
 
+# APEX
+DEXPREOPT_GENERATE_APEX_IMAGE := true
+
 # Audio
 #USE_CUSTOM_AUDIO_POLICY := 1
 USE_XML_AUDIO_POLICY_CONF := 1