Add INSTALLED_DTBOIMAGE_TARGET to droidcore-unbundled

dtbo.img omitted when BOARD_AVB_ENABLE is disabled.
To copy dtbo.img to PRODUCT_OUT, INSTALLED_DTBOIMAGE_TARGET added
to droidcore-unbundled.

Test: Build w/ BOARD_AVB_ENABLE=true and false
Bug: 379030670
Signed-off-by: Junki Min <joonki.min@samsung.com>
Change-Id: Ie59d572ec5e5216cfc3b7ca7ff735a3ac0caab13
diff --git a/core/main.mk b/core/main.mk
index f96cf04..624df49 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1399,6 +1399,7 @@
     $(INSTALLED_RAMDISK_TARGET) \
     $(INSTALLED_BOOTIMAGE_TARGET) \
     $(INSTALLED_INIT_BOOT_IMAGE_TARGET) \
+    $(INSTALLED_DTBOIMAGE_TARGET) \
     $(INSTALLED_RADIOIMAGE_TARGET) \
     $(INSTALLED_DEBUG_RAMDISK_TARGET) \
     $(INSTALLED_DEBUG_BOOTIMAGE_TARGET) \