kconfig: introduce kconfig for UBI

move the UBI config options into Kconfig.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andrew F. Davis <afd@ti.com>
Reviewed by: Evgeni Dobrev <evgeni at studio-punkt.com>
diff --git a/configs/ds414_defconfig b/configs/ds414_defconfig
index 916ea23..1d16833 100644
--- a/configs/ds414_defconfig
+++ b/configs/ds414_defconfig
@@ -25,6 +25,7 @@
 CONFIG_CMD_TIME=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
+CONFIG_CMD_UBI=y
 CONFIG_SPL_OF_TRANSLATE=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y