s390/delay: get rid of not needed header includes

After all the changes to delay.c there are many includes which are not
needed anymore. Get rid of them.

Signed-off-by: Heiko Carstens <[e-mail]>

arch/s390/lib/delay.c

···
  *		 Heiko Carstens <[e-mail]>,
  */
 
-#include <linux/sched.h>
+#include <linux/processor.h>
 #include <linux/delay.h>
-#include <linux/timex.h>
-#include <linux/export.h>
-#include <linux/irqflags.h>
-#include <linux/interrupt.h>
-#include <linux/jump_label.h>
-#include <linux/irq.h>
-#include <asm/vtimer.h>
 #include <asm/div64.h>
-#include <asm/idle.h>
+#include <asm/timex.h>
 
 void __delay(unsigned long loops)
 {