None of the drivers implement it, remove it.

Link: https://lore.kernel.org/r/20200623113043.1228482-4-leon@kernel.orgSigned-off-by: NMaor Gottlieb <maorg@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>