kbuild/sparc64: archhelp and $(build)

Moved archhelp to arch/sparc64/Makefile
introduced usage of $(build)
Removed superflous targets archclean and archmrproper

arch/sparc64/Makefile

@@ -71,11 +71,11 @@ libs-y				+= arch/sparc64/prom/ arch/sparc64/lib/
 # FIXME: is drivers- right?
 drivers-$(CONFIG_OPROFILE)	+= arch/sparc64/oprofile/
 
-makeboot =$(Q)$(MAKE) -f scripts/Makefile.build obj=arch/sparc64/boot $(1)
-
 tftpboot.img vmlinux.aout:
-	$(call makeboot,arch/sparc64/boot/$@)
-
-archmrproper:
-archclean:
+	$(Q)$(MAKE) $(build)=arch/sparc64/boot arch/sparc64/boot/$@
 
+define archhelp
+  echo  '* vmlinux       - Standard sparc64 kernel'
+  echo  '  vmlinux.aout  - a.out kernel for sparc64'
+  echo  '  tftpboot.img  - Image prepared for tftp'
+endef

arch/sparc64/boot/Makefile

@@ -24,7 +24,3 @@ $(obj)/vmlinux.aout: vmlinux FORCE
 	$(call if_changed,elftoaout)
 	@echo '  kernel: $@ is ready'
 
-archhelp:
-	@echo  '* vmlinux       - Standard sparc64 kernel'
-	@echo  '  vmlinux.aout  - a.out kernel for sparc64'
-	@echo  '  tftpboot.img  - Image prepared for tftp'