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/kernel/process.c b/arch/parisc/kernel/process.c
index 4fc0450..46b7593 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -47,7 +47,7 @@
 #include <linux/kallsyms.h>
 
 #include <asm/io.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 #include <asm/pdc.h>
 #include <asm/pdc_chassis.h>
 #include <asm/pgalloc.h>