cmd: Expose a Kconfig option to enable UBIFS commands

Create a new Kconfig entry to allow CMD_UBIFS selection from Kconfig and
add an hidden LZO option that can be selected by CMD_UBIFS.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Jagan Teki <jagan@openedev.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 7404ae5c..7c1f81a 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -835,4 +835,12 @@
 	  (www.linux-mtd.infradead.org). Activate this option if you want
 	  to use U-Boot UBI commands.
 
+config CMD_UBIFS
+	tristate "Enable UBIFS - Unsorted block images filesystem commands"
+	select CRC32
+	select RBTREE if ARCH_SUNXI
+	select LZO if ARCH_SUNXI
+	help
+	  UBIFS is a file system for flash devices which works on top of UBI.
+
 endmenu