xfs: use wait queues directly for the log wait queues

The log grant queues are one of the few places left using sv_t
constructs for waiting. Given we are touching this code, we should
convert them to plain wait queues. While there, convert all the
other sv_t users in the log code as well.

Seeing as this removes the last users of the sv_t type, remove the
header file defining the wrapper and the fragments that still
reference it.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/quota/xfs_dquot.c

@@ -149,7 +149,6 @@ xfs_qm_dqdestroy(
 	ASSERT(list_empty(&dqp->q_freelist));
 
 	mutex_destroy(&dqp->q_qlock);
-	sv_destroy(&dqp->q_pinwait);
 	kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
 
 	atomic_dec(&xfs_Gqm->qm_totaldquots);