kbuild: Provide "make some/dir/module.ko"

Now that we have a unique suffix for kernel modules (.ko), we
can extend to former "make some/object.o" to work for kernel modules
as well, even composite ones.

It's as easy as "make some/dir/module.ko".

(Sam Ravnborg/me)

Makefile

@@ -413,6 +413,8 @@ targets += arch/$(ARCH)/vmlinux.lds.s
 	$(Q)$(MAKE) $(build)=$(@D) $@
 %.o: %.c scripts FORCE
 	$(Q)$(MAKE) $(build)=$(@D) $@
+%.ko: scripts FORCE
+	$(Q)$(MAKE) $(build)=$(@D) $@
 %.lst: %.c scripts FORCE
 	$(Q)$(MAKE) $(build)=$(@D) $@
 %.s: %.S scripts FORCE