mtd: ensure MTD is compiled when CMD_MTDPARTS is selected

MTD support must be enabled when using mtdparts. Indeed, functions
like get_mtd_info(), get_mtd_device() and put_mtd_device() are in
drivers/mtd/mtd_uboot.c and are built only with CONFIG_MTD.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
diff --git a/configs/wb45n_defconfig b/configs/wb45n_defconfig
index beea9a2..17d1a5b 100644
--- a/configs/wb45n_defconfig
+++ b/configs/wb45n_defconfig
@@ -39,3 +39,4 @@
 CONFIG_LZMA=y
 CONFIG_OF_LIBFDT=y
 CONFIG_MTD=y
+CONFIG_MTD_RAW_NAND=y