kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support

Delete obsoleted parts form arch makefiles and rename to asm-offsets.h

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 0403d2f..3b339b1 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -100,15 +100,7 @@
 
 install: kernel_install modules_install
 
-prepare: include/asm-parisc/offsets.h
-
-arch/parisc/kernel/asm-offsets.s: include/asm include/linux/version.h \
-				   include/config/MARKER
-
-include/asm-parisc/offsets.h: arch/parisc/kernel/asm-offsets.s
-	$(call filechk,gen-asm-offsets)
-
-CLEAN_FILES	+= lifimage include/asm-parisc/offsets.h
+CLEAN_FILES	+= lifimage
 MRPROPER_FILES	+= palo.conf
 
 define archhelp