Add system_ext.img to droidcore-unbundled
Otherwise system_ext.img wouldn't be built under $PRODUCT_OUT dir when
building a system.img&system_ext.img only build target.
Bug: 326359088
Test: Build a system/system_ext image only target
Change-Id: I8732f7a578350f8bc3b91f8a1db656bf95eddc95
diff --git a/core/main.mk b/core/main.mk
index 9b7382b..b4ca2a4 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1672,6 +1672,7 @@
$(INSTALLED_SYSTEM_DLKMIMAGE_TARGET) \
$(INSTALLED_SUPERIMAGE_EMPTY_TARGET) \
$(INSTALLED_PRODUCTIMAGE_TARGET) \
+ $(INSTALLED_SYSTEM_EXTIMAGE_TARGET) \
$(INSTALLED_SYSTEMOTHERIMAGE_TARGET) \
$(INSTALLED_TEST_HARNESS_RAMDISK_TARGET) \
$(INSTALLED_TEST_HARNESS_BOOTIMAGE_TARGET) \