[ARM] Remove <asm/atomic.h> include.

asm/processor.h doesn't use atomic operations nor types, so
there's no need to include asm/atomic.h.
Signed-off-by: Russell King <rmk@arm.linux.org.uk>

include/asm-arm/processor.h

@@ -19,7 +19,6 @@
 
 #ifdef __KERNEL__
 
-#include <asm/atomic.h>
 #include <asm/ptrace.h>
 #include <asm/procinfo.h>
 #include <asm/types.h>