Use dtb-y and always make variables to build dtbs instead of explicit
dtbs rule. This is in preparation to support building all dtbs.
Signed-off-by: Rob Herring <robh@kernel.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
        $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 
 dtbs: scripts
-       $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
+       $(Q)$(MAKE) $(build)=$(boot)/dts
 
 archclean:
        $(Q)$(MAKE) $(clean)=$(boot)
 
 dtb-$(CONFIG_METAG_BUILTIN_DTB)        += $(builtindtb-y).dtb
 obj-$(CONFIG_METAG_BUILTIN_DTB)        += $(builtindtb-y).dtb.o
 
-targets        += dtbs
-targets        += $(dtb-y)
-
 .SECONDARY: $(obj)/$(builtindtb-y).dtb.S
 
-dtbs: $(addprefix $(obj)/, $(dtb-y))
-
+always += $(dtb-y)
 clean-files += *.dtb *.dtb.S