IB/core: Make rdma_find_gid_by_filter support all protocols

There is no reason to restrict this function to roce only these days,
allow the filter function to be called on any protocol.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>