cmd: Kconfig: Make CMD_UBI select CMD_MTDPARTS

Many configs still define CMD_MTDPARTS in their non-Kconfig but
CMD_MTDPARTS has now moved to Kconfig.

Signed-off-by: Karl Beldan <karl.beldan-ext@sagemcom.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

cmd/Kconfig

@@ -1255,6 +1255,7 @@ config CMD_UBI
 	tristate "Enable UBI - Unsorted block images commands"
 	select CRC32
 	select MTD_UBI
+	select CMD_MTDPARTS
 	default y if NAND_SUNXI
 	help
 	  UBI is a software layer above MTD layer which admits use of LVM-like