ARM: omap3_logic: Enable UUID

Instead of hardcoding the mmcroot to /dev/mmcblkX, use the UUID
method.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/omap3_logic_defconfig b/configs/omap3_logic_defconfig
index b38b6fd..41fb034 100644
--- a/configs/omap3_logic_defconfig
+++ b/configs/omap3_logic_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_NAND=y
 CONFIG_CMD_NAND_LOCK_UNLOCK=y
 CONFIG_CMD_CACHE=y
+CONFIG_CMD_UUID=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=omap2-nand.0"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:512k(MLO),1792k(u-boot),128k(spl-os),128k(u-boot-env),6m(kernel),-(fs)"