Move building bootloader/radio image task to proper place

Move the task of building bootloader/radio images and unpack their
partitions to build/core/tasks/tools.

Bug: 359426542
Test: presubmit
Change-Id: I3ac1a1a6eb0e21fb1eac6db628e094a13c9fc73f
diff --git a/core/main.mk b/core/main.mk
index 8d0b465..4193389 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -289,6 +289,9 @@
 
 $(foreach mk,$(subdir_makefiles),$(info [$(call inc_and_print,subdir_makefiles_inc)/$(subdir_makefiles_total)] including $(mk) ...)$(eval include $(mk)))
 
+# Build bootloader.img/radio.img, and unpack the partitions.
+include $(BUILD_SYSTEM)/tasks/tools/update_bootloader_radio_image.mk
+
 # For an unbundled image, we can skip blueprint_tools because unbundled image
 # aims to remove a large number framework projects from the manifest, the
 # sources or dependencies for these tools may be missing from the tree.