davinci: omapl138-lcdk: enable driver-model in SPL

Enable CONFIG_SPL_DM and enable the driver model for serial by defining
an appropriate device in the board file for da850-lcdk.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
diff --git a/configs/omapl138_lcdk_defconfig b/configs/omapl138_lcdk_defconfig
index c4eebb3..26b4950 100644
--- a/configs/omapl138_lcdk_defconfig
+++ b/configs/omapl138_lcdk_defconfig
@@ -33,10 +33,13 @@
 CONFIG_CMD_DIAG=y
 CONFIG_CMD_UBI=y
 CONFIG_OF_CONTROL=y
+CONFIG_SPL_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="da850-lcdk"
+CONFIG_SPL_OF_PLATDATA=y
 CONFIG_ENV_IS_IN_NAND=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DM=y
+CONFIG_SPL_DM=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_DAVINCI=y
 CONFIG_DM_MMC=y
@@ -51,6 +54,8 @@
 CONFIG_DM_ETH=y
 CONFIG_MII=y
 CONFIG_DRIVER_TI_EMAC=y
+CONFIG_SPECIFY_CONSOLE_INDEX=y
 CONFIG_DM_SERIAL=y
 CONFIG_SYS_NS16550=y
 CONFIG_USE_TINY_PRINTF=y
+# CONFIG_SPL_OF_LIBFDT is not set