ARM: 6939/1: fix missing 'cpu_relax()' declaration

ARM build fails with the following symptom:

CC arch/arm/kernel/asm-offsets.s
In file included from include/linux/seqlock.h:29,
from include/linux/time.h:8,
from include/linux/timex.h:56,
from include/linux/sched.h:57,
from arch/arm/kernel/asm-offsets.c:13:
include/linux/spinlock.h: In function 'spin_unlock_wait':
include/linux/spinlock.h:360: error: implicit declaration of function 'cpu_relax'
make[1]: *** [arch/arm/kernel/asm-offsets.s] Error 1

Fix it by including <asm/processor.h>.

Signed-off-by: Marc Zyngier <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/include/asm/spinlock.h

···
 #error SMP not supported on pre-ARMv6 CPUs
 #endif
 
+#include <asm/processor.h>
+
 /*
  * sev and wfe are ARMv6K extensions.  Uniprocessor ARMv6 may not have the K
  * extensions, so when running on UP, we have to patch these instructions away.