Init and check the eee feature
int phy_init_eee(struct phy_device * phydev, bool clk_stop_enable);
phydev
target phy_device struct
clk_stop_enable
PHY may stop the clock during LPI
it checks if the Energy-Efficient Ethernet (EEE) is supported by looking at the MMD registers 3.20 and 7.60/61 and it programs the MMD register 3.0 setting the “Clock stop enable” bit if required.