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/lib/fixup.S b/arch/parisc/lib/fixup.S
index 134f0cd..1b91612 100644
--- a/arch/parisc/lib/fixup.S
+++ b/arch/parisc/lib/fixup.S
@@ -20,7 +20,7 @@
  * Fixup routines for kernel exception handling.
  */
 #include <linux/config.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 #include <asm/assembly.h>
 #include <asm/errno.h>