Convert CONFIG_CMD_MTDPARTS_SPREAD to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_MTDPARTS_SPREAD

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>
[trini: Make this a bool not a string]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 67890c7..4d89af4 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1230,6 +1230,16 @@
 	  Defines a default MTD partitioning scheme in the Linux MTD command
 	  line partitions format
 
+config CMD_MTDPARTS_SPREAD
+	bool "Padd partition size to take account of bad blocks"
+	depends on CMD_MTDPARTS
+	help
+	  This enables the 'spread' sub-command of the mtdparts command.
+	  This command will modify the existing mtdparts variable by increasing
+	  the size of the partitions such that 1) each partition's net size is
+	  at least as large as the size specified in the mtdparts variable and
+	  2) each partition starts on a good block.
+
 endmenu
 
 menu "Debug commands"