net: fec: use phy_interface_mode_is_rgmii() to check RGMII mode

Use the generic helper function phy_interface_mode_is_rgmii() to check
RGMII mode.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20250711091639.1374411-2-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Wei Fang

drivers/net/ethernet/freescale/fec_main.c

@@ -1194,10 +1194,7 @@ fec_restart(struct net_device *ndev)
 		rcntl |= 0x40000000 | 0x00000020;
 
 		/* RGMII, RMII or MII */
-		if (fep->phy_interface == PHY_INTERFACE_MODE_RGMII ||
-		    fep->phy_interface == PHY_INTERFACE_MODE_RGMII_ID ||
-		    fep->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID ||
-		    fep->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID)
+		if (phy_interface_mode_is_rgmii(fep->phy_interface))
 			rcntl |= (1 << 6);
 		else if (fep->phy_interface == PHY_INTERFACE_MODE_RMII)
 			rcntl |= FEC_RCR_RMII;