Convert CONFIG_CMD_UNIVERSE to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_UNIVERSE

Since no board uses this, perhaps we should drop this command?

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 1ab1cf7..1621531 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -863,6 +863,12 @@
 	  This provides various sub-commands to initialise and configure the
 	  Turndra tsi148 device. See the command help for full details.
 
+config CMD_UNIVERSE
+	bool "universe - Command to set up the Turndra Universe controller"
+	help
+	  This allows setting up the VMEbus provided by this controller.
+	  See the command help for full details.
+
 config CMD_USB
 	bool "usb"
 	help