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>

include/asm-parisc/assembly.h

@@ -63,7 +63,7 @@
 	.level 2.0w
 #endif
 
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 #include <asm/page.h>
 
 #include <asm/asmregs.h>