board: da8xxevm: Add SPL DM for serial, spi

This patch add SPL DM support for da8xxevm boards
with SPL serial, SPI drivers supported via platdata.

Cc: Adam Ford <aford173@gmail.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Adam Ford <aford173@gmail.com> #da850evm
diff --git a/configs/da850evm_defconfig b/configs/da850evm_defconfig
index 6dc70dd..5df45ae 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL=y
+CONFIG_SPL_DM=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=1
@@ -37,6 +38,8 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=spi0.0:512k(u-boot.ais),64k(u-boot-env),7552k(kernel-spare),64k(MAC-Address)"
 CONFIG_CMD_DIAG=y
 CONFIG_OF_CONTROL=y
+CONFIG_SPL_OF_CONTROL=y
+CONFIG_SPL_OF_PLATDATA=y
 CONFIG_DEFAULT_DEVICE_TREE="da850-evm"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_DM=y