The driver is spamming the kernel logs for entirely harmless errors from
user space submitting unsupported commands. Just silence the errors.
The application has direct access to command status, so there's no need
to log these.

And since every passthrough command now uses the quiet flag, move the
setting to the common initializer.
Signed-off-by: NKeith Busch <kbusch@kernel.org>
Reviewed-by: NAlan Adamson <alan.adamson@oracle.com>
Reviewed-by: NJens Axboe <axboe@kernel.dk>
Reviewed-by: NKanchan Joshi <joshi.k@samsung.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: NDaniel Wagner <dwagner@suse.de>
Tested-by: NAlan Adamson <alan.adamson@oracle.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>