RDMA/bnxt_re: Use auxiliary driver interface

Use auxiliary driver interface for driver load, unload ROCE driver.
The driver does not need to register the interface using the netdev
notifier anymore. Removed the bnxt_re_dev_list which is not needed.
Currently probe, remove and shutdown ops have been implemented for
the auxiliary device.
Also remove exccessve validation checks for rdev.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

drivers/infiniband/hw/bnxt_re/bnxt_re.h

@@ -89,13 +89,6 @@ struct bnxt_re_ring_attr {
 	u8		mode;
 };
 
-struct bnxt_re_work {
-	struct work_struct	work;
-	unsigned long		event;
-	struct bnxt_re_dev      *rdev;
-	struct net_device	*vlan_dev;
-};
-
 struct bnxt_re_sqp_entries {
 	struct bnxt_qplib_sge sge;
 	u64 wrid;
@@ -132,6 +125,7 @@ struct bnxt_re_dev {
 #define BNXT_RE_FLAG_ERR_DEVICE_DETACHED       17
 #define BNXT_RE_FLAG_ISSUE_ROCE_STATS          29
 	struct net_device		*netdev;
+	struct notifier_block		nb;
 	unsigned int			version, major, minor;
 	struct bnxt_qplib_chip_ctx	*chip_ctx;
 	struct bnxt_en_dev		*en_dev;
@@ -194,5 +188,4 @@ static inline struct device *rdev_to_dev(struct bnxt_re_dev *rdev)
 		return  &rdev->ibdev.dev;
 	return NULL;
 }
-
 #endif