staging: wilc1000: use mutex instead of struct semaphore hif_sema_deinit

This patch replaces struct semaphore hif_sema_deinit with struct mutex
hif_deinit_lock. It is better to use mutex because mutex gives better
performance than semaphore.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>