sparc: Make atomic locks raw

SPIN_LOCK_UNLOCKED is deprecated and the locks which protect the
atomic operations have no dependency on other locks and the code is
well tested so the conversion to a raw lock is safe.

Make the lock array static while at it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>