net: dsa: microchip: fix RGMII error in KSZ DSA driver

The driver should return RMII interface when XMII is running in RMII mode.

Fixes: 0ab7f6b ("net: dsa: microchip: ksz9477: use common xmii function")
Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Acked-by: Jerry Ray <jerry.ray@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/1716932066-3342-1-git-send-email-Tristram.Ha@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/microchip/ksz_common.c

@@ -3142,7 +3142,7 @@ phy_interface_t ksz_get_xmii(struct ksz_device *dev, int port, bool gbit)
 		else
 			interface = PHY_INTERFACE_MODE_MII;
 	} else if (val == bitval[P_RMII_SEL]) {
-		interface = PHY_INTERFACE_MODE_RGMII;
+		interface = PHY_INTERFACE_MODE_RMII;
 	} else {
 		interface = PHY_INTERFACE_MODE_RGMII;
 		if (data8 & P_RGMII_ID_EG_ENABLE)