mx23_olinuxino: enable device tree

Add the dts file for the Olimex Olinuxino from the linux kernel, and enable
its use in this machine's defconfig.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
diff --git a/configs/mx23_olinuxino_defconfig b/configs/mx23_olinuxino_defconfig
index 0da54c9..2bf6818 100644
--- a/configs/mx23_olinuxino_defconfig
+++ b/configs/mx23_olinuxino_defconfig
@@ -11,6 +11,7 @@
 CONFIG_TARGET_MX23_OLINUXINO=y
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL=y
+CONFIG_DEFAULT_DEVICE_TREE="imx23-olinuxino"
 CONFIG_BOOTDELAY=3
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_ARCH_MISC_INIT=y
@@ -24,6 +25,7 @@
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
+CONFIG_OF_CONTROL=y
 CONFIG_ENV_OVERWRITE=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
@@ -44,4 +46,3 @@
 CONFIG_USB_STORAGE=y
 CONFIG_USB_HOST_ETHER=y
 CONFIG_USB_ETHER_SMSC95XX=y
-CONFIG_OF_LIBFDT=y