dts: bindings: ethernet: Change the property names in the DTS

Rename the following propertys in bindings and DTS:
-- location-phy_mdc => location-phy-mdc
-- location-phy_mdio => location-phy-mdio
-- location-rmii_refclk => location-phy-refclk
-- location-rmii_crs_dv => location-phy-crs-dv
-- location-rmii_txd0 => location-phy-txd0
-- location-rmii_txd1 => location-phy-txd1
-- location-rmii_tx_en => location-phy-tx-en
-- location-rmii_rxd0 => location-phy-rxd0
-- location-rmii_rxd1 => location-phy-rxd1
-- location-rmii_rx_er => location-phy-rx-er
-- location-phy_pwr_enable => location-phy-pwr-enable
-- location-phy_reset => location-phy-reset
-- location-phy_interrupt => location-phy-interrupt

Signed-off-by: James Roy <rruuaanng@outlook.com>