crypto: sahara - Remove leftover from previous used spinlock

This driver previously used a spinlock. The spinlock is not
used any more, but the spinlock variable was still there
and also being initialized.

Signed-off-by: Mogens Lauridsen <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/sahara.c

···
 	struct completion	dma_completion;
 
 	struct sahara_ctx	*ctx;
-	spinlock_t		lock;
 	struct crypto_queue	queue;
 	unsigned long		flags;
 
···
 
 	crypto_init_queue(&dev->queue, SAHARA_QUEUE_LENGTH);
 
-	spin_lock_init(&dev->lock);
 	mutex_init(&dev->queue_mutex);
 
 	dev_ptr = dev;