configs: x530: move MTDPART/MTDIDS_DEFAULT in defconfig

Replace MTDIDS_DEFAULT and MTDPARTS_DEFAULT in the config include file by
CONFIG_MTDIDS_DEFAULT and CONFIG_MTDPARTS_DEFAULT in defconfig to complete
the Kconfig migration.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/configs/x530_defconfig b/configs/x530_defconfig
index 2f8be2f..70c08ad 100644
--- a/configs/x530_defconfig
+++ b/configs/x530_defconfig
@@ -57,6 +57,8 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_CMD_MTDPARTS=y
+CONFIG_MTDIDS_DEFAULT="nand0=nand"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=nand:240M(user),8M(errlog),8M(nand-bbt)"
 CONFIG_CMD_UBI=y
 CONFIG_ENV_OVERWRITE=y
 CONFIG_ARP_TIMEOUT=200