phy: atheros: Clarify the configuration of the CLK_25M output pin

Also take the opportunity to use the phy_read_mmd and phy_write_mmd
convenience functions.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
1 file changed