cpwatchdog, remove SPIN_LOCK_UNLOCKED

SPIN_LOCK_UNLOCKED is deprecated, use __SPIN_LOCK_UNLOCKED with an unique
name instead
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>