Add 16K boot image and dtbo image to dependency list of target files

In aosp/3236458 these two artifacts are added to target-files.zip, but
they are not listed as dependency of target-files.zip. Depending on
build order and clean spec, sometimes this leads to missing files.

Test: th
Change-Id: I70e3b3691e77112c2427d95930b0c27a8042884b
diff --git a/core/Makefile b/core/Makefile
index bf2d48a..43495ed 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -6464,6 +6464,8 @@
 	    $(INSTALLED_2NDBOOTLOADER_TARGET) \
 	    $(BUILT_RAMDISK_16K_TARGET) \
 	    $(BUILT_KERNEL_16K_TARGET) \
+	    $(BUILT_BOOTIMAGE_16K_TARGET) \
+	    $(INSTALLED_DTBOIMAGE_16KB_TARGET) \
 	    $(BOARD_PREBUILT_DTBOIMAGE) \
 	    $(BOARD_PREBUILT_RECOVERY_DTBOIMAGE) \
 	    $(BOARD_RECOVERY_ACPIO) \