net: phylink: validate only used interfaces for c45 PHYs

Some clause 45 PHYs such as Marvell 88X33x0 and Broadcom 84881 switch
between a set of interface types depending on the negotiated media
speed.

We currently validate this kind of PHY using all MAC capabilities,
which is not correct if that would give a superset of the ethtool link
modes.

This commit uses the previously introduced phy possible_interfaces, and
the recently introduced supported_interfaces to calculate the union of
interface support, and then validates only those interfaces.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

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