configs: T1024RDB: enable DM_SERIAL

As the serial devices are configured in the device tree, enable
DM_SERIAL in the non-SPL T1024RDB defconfigs.

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/T1024RDB_defconfig b/configs/T1024RDB_defconfig
index 5e8dfbf..0d0707e 100644
--- a/configs/T1024RDB_defconfig
+++ b/configs/T1024RDB_defconfig
@@ -101,7 +101,9 @@
 CONFIG_SYS_QE_FMAN_FW_IN_NOR=y
 CONFIG_DM_RTC=y
 CONFIG_RTC_DS1337=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_ESPI=y