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/m68k/fpsp040/skeleton.S b/arch/m68k/fpsp040/skeleton.S
index dbc1255..9571a21 100644
--- a/arch/m68k/fpsp040/skeleton.S
+++ b/arch/m68k/fpsp040/skeleton.S
@@ -40,7 +40,7 @@
 
 #include <linux/linkage.h>
 #include <asm/entry.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 
 |SKELETON	idnt    2,1 | Motorola 040 Floating Point Software Package