[S390] merge cpu.h into cputime.h

All definition in cpu.h have to do with cputime accounting. Move
them to cputime.h and remove the header file.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 28cf196..015e27d 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -16,7 +16,7 @@
 #include <asm/lowcore.h>
 #include <asm/smp.h>
 #include <asm/etr.h>
-#include <asm/cpu.h>
+#include <asm/cputime.h>
 #include <asm/nmi.h>
 #include <asm/crw.h>