configs: ls1088a: enable DM_SERIAL

Now that the DT nodes for the serial devices are in place for these
boards, enable DM_SERIAL in the associated configs.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/ls1088aqds_tfa_defconfig b/configs/ls1088aqds_tfa_defconfig
index 4195724..09e273a 100644
--- a/configs/ls1088aqds_tfa_defconfig
+++ b/configs/ls1088aqds_tfa_defconfig
@@ -118,7 +118,9 @@
 CONFIG_DM_RTC=y
 CONFIG_RTC_PCF2127=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