Staging: w35und: remove spinlock wrappers

This patch removes the OS_SPIN_LOCK and related wrappers from the driver code.

Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>