mtd: ensure MTD_RAW_NAND is compiled when ENV_IS_IN_NAND is selected

Raw NAND support must be enabled when the environment is in NAND.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
diff --git a/configs/harmony_defconfig b/configs/harmony_defconfig
index 4429896..dedc04e 100644
--- a/configs/harmony_defconfig
+++ b/configs/harmony_defconfig
@@ -34,6 +34,7 @@
 CONFIG_SPL_DM=y
 CONFIG_MTD=y
 CONFIG_DM_MTD=y
+CONFIG_MTD_RAW_NAND=y
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_FASTMAP=y
 CONFIG_PCI=y