armv8: ls1043/ls1046aqds: add support for RGMII_TXID

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1043aqds/eth.c b/board/freescale/ls1043aqds/eth.c
index bf26376..3411bed 100644
--- a/board/freescale/ls1043aqds/eth.c
+++ b/board/freescale/ls1043aqds/eth.c
@@ -476,6 +476,7 @@
 			}
 			break;
 		case PHY_INTERFACE_MODE_RGMII:
+		case PHY_INTERFACE_MODE_RGMII_TXID:
 			if (i == FM1_DTSEC3)
 				mdio_mux[i] = EMI1_RGMII1;
 			else if (i == FM1_DTSEC4)