Merge branch 'mlxsw-Various-updates'

Ido Schimmel says:

====================
mlxsw: Various updates

Patch #1 from Amit removes 56G speed support. The reasons for this are
detailed in the commit message.

Patch #2 from Shalom ensures that the hardware does not auto negotiate
the number of used lanes. For example, if a four lane port supports 100G
over both two and four lanes, it will not advertise the two lane link
mode.

Patch #3 bumps the firmware version supported by the driver.

Patch #4 from Petr adds ethtool counters to help debug the internal PTP
implementation in mlxsw. I copied Richard on this patch in case he has
comments.
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Signed-off-by: David S. Miller <davem@davemloft.net>