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/pcm058_defconfig b/configs/pcm058_defconfig
index 36cef56..b2f70ea 100644
--- a/configs/pcm058_defconfig
+++ b/configs/pcm058_defconfig
@@ -35,6 +35,7 @@
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_CMD_UBI=y
 CONFIG_DM=y
 CONFIG_MTD=y
 CONFIG_SPI_FLASH=y