Merge branch 'phy-internal'

Florian Fainelli says:

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net: phy: Support "internal" PHY interface

This makes the "internal" phy-mode property generally available and
documented and this allows us to remove some custom parsing code
we had for bcmgenet and bcm_sf2 which both used that specific value.
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Signed-off-by: David S. Miller <davem@davemloft.net>