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/ppc64/kernel/vdso32/datapage.S b/arch/ppc64/kernel/vdso32/datapage.S
index 29b6bd3..4f4eb0b 100644
--- a/arch/ppc64/kernel/vdso32/datapage.S
+++ b/arch/ppc64/kernel/vdso32/datapage.S
@@ -12,7 +12,7 @@
 #include <linux/config.h>
 #include <asm/processor.h>
 #include <asm/ppc_asm.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 #include <asm/unistd.h>
 #include <asm/vdso.h>