Add missing custom kernel module targets

Custom kernel module targets are not in the build dependency rule
which cause the copy command of $(my_copy_pairs) fail.
Add it back to $(my_image_copy_files) and remove the prefixed
$(my_staging_dir) from dest of kernel module copy pair.
Then the makefile can handle it well.

Bug: 195888474
Change-Id: Id8cb4c4991905e8bc53ddb5e60e87a36fe43e803
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
diff --git a/core/tasks/tools/build_custom_image.mk b/core/tasks/tools/build_custom_image.mk
index 8b766ae..f9ae2c1 100644
--- a/core/tasks/tools/build_custom_image.mk
+++ b/core/tasks/tools/build_custom_image.mk
@@ -57,13 +57,15 @@
 my_kernel_module_copy_files :=
 my_custom_image_modules_var := BOARD_$(strip $(call to-upper,$(my_custom_image_name)))_KERNEL_MODULES
 ifdef $(my_custom_image_modules_var)
-  my_kernel_module_copy_files += $(call build-image-kernel-modules,$($(my_custom_image_modules_var)),$(my_staging_dir),$(CUSTOM_IMAGE_MOUNT_POINT),$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)),$($(my_custom_image_modules_var)),modules.load,,$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)_stripped))
-  my_copy_pairs += $(my_kernel_module_copy_files)
+$(foreach kmod,\
+  $(call build-image-kernel-modules,$($(my_custom_image_modules_var)),$(my_staging_dir),$(CUSTOM_IMAGE_MOUNT_POINT),$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)),$($(my_custom_image_modules_var)),modules.load,,$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)_stripped)),\
+  $(eval pair := $(subst :,$(space),$(kmod)))\
+  $(eval my_kernel_module_copy_files += $(word 1,$(pair)):$(subst $(my_staging_dir)/,,$(word 2,$(pair)))))
 endif
 
 # Collect CUSTOM_IMAGE_COPY_FILES.
 my_image_copy_files :=
-$(foreach f,$(CUSTOM_IMAGE_COPY_FILES),\
+$(foreach f,$(CUSTOM_IMAGE_COPY_FILES) $(my_kernel_module_copy_files),\
   $(eval pair := $(subst :,$(space),$(f)))\
   $(eval src := $(word 1,$(pair)))\
   $(eval my_image_copy_files += $(src))\