mpc85xx, socrates: enable DM serial

switch to DM_SERIAL support.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/socrates_defconfig b/configs/socrates_defconfig
index 80b5631..5bd60e0 100644
--- a/configs/socrates_defconfig
+++ b/configs/socrates_defconfig
@@ -46,6 +46,9 @@
 CONFIG_TSEC_ENET=y
 CONFIG_DM_RTC=y
 CONFIG_RTC_RX8025=y
+CONFIG_SPECIFY_CONSOLE_INDEX=y
+CONFIG_DM_SERIAL=y
+CONFIG_SERIAL_SEARCH_ALL=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_DM_USB=y