Merge branch 'SMSC-Cleanups-and-clock-setup'

Marco Felsch says:

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SMSC: Cleanups and clock setup

this small series cleans the smsc-phy code a bit and adds the support to
specify the phy clock source. Adding the phy clock source support is
also the main purpose of this series.

Each file has its own changelog.

Thanks a lot to Florian and Andrew for reviewing it.
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Signed-off-by: David S. Miller <davem@davemloft.net>