fs: Convert CONFIG_CMD_CRAMFS to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_CRAMFS

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: imply CMD_CRAMFS for keymile]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 9eb6a35..4145fcf 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -899,6 +899,16 @@
 	  U-Boot to actually boot the Operating System. Available commands are
 	  cbfsinit, cbfsinfo, cbfsls and cbfsload.
 
+config CMD_CRAMFS
+	bool "Enable the 'cramfs' command"
+	help
+	  This provides commands for dealing with CRAMFS (Compressed ROM
+	  filesystem). CRAMFS is useful when space is tight since files are
+	  compressed. Two commands are provided:
+
+	     cramfsls   - lists files in a cramfs image
+	     cramfsload - loads a file from a cramfs image
+
 config CMD_EXT2
 	bool "ext2 command support"
 	help