Merge branch 'BCM54612E'

Xo Wang says:

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Broadcom BCM54612E support

This series is based on tip of torvalds/master.

The first patch adds register definitions from Broadcom docs.

The second patch adds the BCM54612E PHY ID, flags, and device-specific
RGMII internal delay initialization.

I tested on a custom board with an Aspeed AST2500 SOC with its second
MAC connected to this PHY.
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Signed-off-by: David S. Miller <davem@davemloft.net>