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/include/asm-xtensa/uaccess.h b/include/asm-xtensa/uaccess.h
index fc268ac..06a22b8 100644
--- a/include/asm-xtensa/uaccess.h
+++ b/include/asm-xtensa/uaccess.h
@@ -25,7 +25,7 @@
 
 #define _ASMLANGUAGE
 #include <asm/current.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 #include <asm/processor.h>
 
 /*