net: eqos: implement callbaks to get interface and set txclk rate

Implement the callbacks to get phy mode interface and txclk
rate configuration.

Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>