net/mlx5: Implement get_module_eeprom_by_page()

Implement ethtool_ops::get_module_eeprom_by_page() to enable
support of new SFP standards.

Signed-off-by: Vladyslav Tarasiuk <vladyslavt@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>