net/mlx5e: IPoIB, Add ioctl support to IPoIB device driver

Add ioctl support to IPoIB device driver. For now, this
ioctl will support timestamp get and set.

Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Eitan Rabin <rabin@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>