Nokia RX-51: Revert back onenand defitions

In commit commit 43ede0bca7fc ("Kconfig: Migrate MTDIDS_DEFAULT /
MTDPARTS_DEFAULT") were removed definitions for onenand partitions.

Revert them back and enable needed options for onenand support.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/configs/nokia_rx51_defconfig b/configs/nokia_rx51_defconfig
index 5ba9768..13bb6d0 100644
--- a/configs/nokia_rx51_defconfig
+++ b/configs/nokia_rx51_defconfig
@@ -39,3 +39,10 @@
 CONFIG_VIDEO=y
 CONFIG_CFB_CONSOLE_ANSI=y
 # CONFIG_VGA_AS_SINGLE_DEVICE is not set
+CONFIG_MTD=y
+CONFIG_MTDIDS_DEFAULT="onenand0=onenand"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=onenand:128k(bootloader)ro,384k(config),256k(log),2m(kernel),2m(initfs),-(rootfs)"
+CONFIG_MTD_PARTITIONS=y
+# CONFIG_MTD_RAW_NAND is not set
+CONFIG_CMD_MTD=y
+CONFIG_CMD_ONENAND=y