kbuild: arm - use generic asm-offsets.h support

Delete obsoleted stuff from arch Makefile and rename
constants.h to asm-offsets.h

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 67f1453..e625ac6 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -178,7 +178,7 @@
 prepare: maketools include/asm-arm/.arch
 
 .PHONY: maketools FORCE
-maketools: include/asm-arm/constants.h include/linux/version.h FORCE
+maketools: include/linux/version.h FORCE
 	$(Q)$(MAKE) $(build)=arch/arm/tools include/asm-arm/mach-types.h
 
 # Convert bzImage to zImage
@@ -190,7 +190,7 @@
 zinstall install: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
 
-CLEAN_FILES += include/asm-arm/constants.h* include/asm-arm/mach-types.h \
+CLEAN_FILES += include/asm-arm/mach-types.h \
 	       include/asm-arm/arch include/asm-arm/.arch
 
 # We use MRPROPER_FILES and CLEAN_FILES now
@@ -201,11 +201,6 @@
 bp:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/bootpImage
 i zi:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
 
-arch/$(ARCH)/kernel/asm-offsets.s: include/asm include/linux/version.h \
-				   include/asm-arm/.arch
-
-include/asm-$(ARCH)/constants.h: arch/$(ARCH)/kernel/asm-offsets.s
-	$(call filechk,gen-asm-offsets)
 
 define archhelp
   echo  '* zImage        - Compressed kernel image (arch/$(ARCH)/boot/zImage)'