Merge branch 'mlxsw-Add-support-for-cable-info-access'

Jiri Pirko says:

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mlxsw: Add support for cable info access

Add support for cable info access via ethtool. This is done by accessing
the SFP+/QSFP internal EEPROM.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>