am a230c4d0: Reference kernel notice in the new location

# make the target NOTICE files depend on this particular file too, which will

# then be in the right directory for the find in combine-notice-files to work.

$(kernel_notice_file): \

	    prebuilt/$(TARGET_PREBUILT_TAG)/kernel/LINUX_KERNEL_COPYING \

	    prebuilts/qemu-kernel/arm/LINUX_KERNEL_COPYING \

	    | $(ACP)

	@echo Copying: $@

	$(hide) mkdir -p $(dir $@)