Convert CONFIG_CMD_BEDBUG to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_BEDBUG

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index e52af92..0c6d44e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -867,6 +867,17 @@
 
 endmenu
 
+menu "Debug commands"
+
+config CMD_BEDBUG
+	bool "bedbug"
+	help
+	  The bedbug (emBEDded deBUGger) command provides debugging features
+	  for some PowerPC processors. For details please see the
+	  docuemntation in doc/README.beddbug
+
+endmenu
+
 config CMD_UBI
 	tristate "Enable UBI - Unsorted block images commands"
 	select CRC32