board: Switch Abilis TB-100 board to Driver Model for serial port

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/configs/tb100_defconfig b/configs/tb100_defconfig
index c964272..59f09d9 100644
--- a/configs/tb100_defconfig
+++ b/configs/tb100_defconfig
@@ -1,5 +1,10 @@
 CONFIG_ARC=y
 CONFIG_ARC_CACHE_LINE_SHIFT=5
 CONFIG_TARGET_TB100=y
+CONFIG_DM=y
+CONFIG_DM_SERIAL=y
+CONFIG_DEFAULT_DEVICE_TREE="abilis_tb100"
 CONFIG_SYS_TEXT_BASE=0x84000000
 CONFIG_SYS_CLK_FREQ=500000000
+CONFIG_OF_CONTROL=y
+CONFIG_OF_EMBED=y