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>

cmd/Kconfig

@@ -1230,6 +1230,16 @@ config MTDPARTS_DEFAULT
 	  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"

configs/sandbox_defconfig

@@ -61,6 +61,7 @@ CONFIG_CMD_TPM_TEST=y
 CONFIG_CMD_CBFS=y
 CONFIG_CMD_CRAMFS=y
 CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_MTDPARTS=y
 CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y

scripts/config_whitelist.txt

@@ -293,7 +293,6 @@ CONFIG_CM922T_XA10
 CONFIG_CMDLINE_EDITING
 CONFIG_CMDLINE_PS_SUPPORT
 CONFIG_CMDLINE_TAG
-CONFIG_CMD_MTDPARTS_SPREAD
 CONFIG_CMD_ONENAND
 CONFIG_CMD_PCA953X
 CONFIG_CMD_PCA953X_INFO