microblaze: add linux.bin* and simpleImage.* to PHONY

linux.bin, linux.bin.gz, and linux.bin.ub are phony targets to
generate a corresponding image under arch/microblaze/boot/.

simpleImage.% also works like a phony target, but a pattern that
contains '%' cannot be a phony target. I replaced it with equivalent
simpleImage.$(DTB).
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/Makefile

@@ -82,11 +82,13 @@ archclean:
 archheaders:
 	$(Q)$(MAKE) $(build)=arch/microblaze/kernel/syscalls all
 
+PHONY += linux.bin linux.bin.gz linux.bin.ub
 linux.bin linux.bin.gz linux.bin.ub: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 	@echo 'Kernel: $(boot)/$@ is ready' ' (#'`cat .version`')'
 
-simpleImage.%: vmlinux
+PHONY += simpleImage.$(DTB)
+simpleImage.$(DTB): vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $(addprefix $(boot)/$@., ub unstrip strip)
 	@echo 'Kernel: $(boot)/$@ is ready' ' (#'`cat .version`')'