phylib: add support for aquantia PHYs

This patch supports AQ1202, AQ2104, AQR105 PHY.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <yorksun@freescale.com>