Alchemy Semi Au1000 pcmcia driver: The semaphore pcmcia_sockets_lock
is used as a mutex, convert it to the mutex API

(akpm: make it static too)
Signed-off-by: NMatthias Kaehlcke <matthias@kaehlcke.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>