gta4xlwifi: Generate the apex image.

Change-Id: I18a76766590db27a4c32534dc948f55f78da166c
diff --git a/BoardConfig.mk b/BoardConfig.mk
index aa54d69..f9e8742 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -18,6 +18,9 @@
 
 DEVICE_PATH := device/samsung/gta4xlwifi
 
+# APEX image
+DEXPREOPT_GENERATE_APEX_IMAGE := true
+
 PRODUCT_PLATFORM := exynos9611
 
 TARGET_OTA_ASSERT_DEVICE := gta4xlwifi,gta4xlwifixx