RDMA/core: Implement RoCE GID port rescan and export delete function

RDMA/core: Implement RoCE GID port rescan and export delete function

rdma_roce_rescan_port() scans all network devices in
the system and adds the gids if relevant to the RoCE device
port. When not in bonding mode it adds the GIDs of the
netdevice in this port. When in bonding mode it adds the
GIDs of both the port's netdevice and the bond master
netdevice.

Export roce_del_all_netdev_gids(), which  removes all GIDs
associated with a specific netdevice for a given port.

Signed-off-by: Chiara Meiohas <cmeiohas@nvidia.com>
Link: https://patch.msgid.link/674d498da4637a1503ff1367e28bd09ff942fd5e.1730381292.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>