s390/idle: reduce size of s390_idle_data structure

Avoid padding in the middle and the end of the data structure by
moving nohz_delay member to the beginning.
Saves eight byte per cpu.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/cputime.h

@@ -167,12 +167,12 @@ static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
 }
 
 struct s390_idle_data {
+	int nohz_delay;
 	unsigned int sequence;
 	unsigned long long idle_count;
 	unsigned long long idle_enter;
 	unsigned long long idle_exit;
 	unsigned long long idle_time;
-	int nohz_delay;
 };
 
 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);