{IB,net}/mlx5: Assign mkey variant in mlx5_ib only

mkey variant is not required for mlx5_core use, move the mkey variant
counter to mlx5_ib.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -992,6 +992,11 @@ struct mlx5_ib_dev {
 	/* sync used page count stats
 	 */
 	struct mlx5_ib_resources	devr;
+
+	/* protect mkey key part */
+	spinlock_t			mkey_lock;
+	u8				mkey_key;
+
 	struct mlx5_mr_cache		cache;
 	struct timer_list		delay_timer;
 	/* Prevents soft lock on massive reg MRs */