net: phy: LAN937x: added PHY_POLL_CABLE_TEST flag

Added the phy_poll_cable_test flag for the lan937x phy driver.
Tested using command -  ethtool --cable-test <dev>

Fixes: 680baca5 ("net: phy: added the LAN937x phy support")
Signed-off-by: NArun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/microchip_t1.c

@@ -743,6 +743,7 @@ static struct phy_driver microchip_t1_phy_driver[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_LAN937X),
 		.name		= "Microchip LAN937x T1",
+		.flags          = PHY_POLL_CABLE_TEST,
 		.features	= PHY_BASIC_T1_FEATURES,
 		.config_init	= lan87xx_config_init,
 		.suspend	= genphy_suspend,