configs: ten64: enable DM_SERIAL

The recent series "Convert LS1088A and LX2160 to DM_SERIAL"
from Ioana Ciornei provided the necessary support to enable
DM_SERIAL on the Ten64 board (LS1088A).

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> # on LS1088A-RDB
diff --git a/configs/ten64_tfa_defconfig b/configs/ten64_tfa_defconfig
index c16e58e..9797a34 100644
--- a/configs/ten64_tfa_defconfig
+++ b/configs/ten64_tfa_defconfig
@@ -81,7 +81,9 @@
 CONFIG_DM_RTC=y
 CONFIG_RTC_RX8025=y
 CONFIG_DM_SCSI=y
-CONFIG_SYS_NS16550_SERIAL=y
+CONFIG_SPECIFY_CONSOLE_INDEX=y
+CONFIG_DM_SERIAL=y
+CONFIG_SYS_NS16550=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_FSL_DSPI=y