configs: socfpga: mcvevk: Remove useless UBI infos

There is no flash on this board, there is no reason to define MTD
environment variables nor UBI. Drop them from the configuration file.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Wolfgang Grandegger <wg@aries-embedded.de>

configs/socfpga_mcvevk_defconfig

@@ -29,9 +29,6 @@ CONFIG_CMD_USB=y
 CONFIG_CMD_USB_MASS_STORAGE=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT4_WRITE=y
-CONFIG_MTDIDS_DEFAULT="nor0=ff705000.spi.0"
-CONFIG_MTDPARTS_DEFAULT="mtdparts=ff705000.spi.0:1m(u-boot),256k(env1),256k(env2),14848k(boot),16m(rootfs),-@1536k(UBI)"
-CONFIG_CMD_UBI=y
 # CONFIG_ISO_PARTITION is not set
 # CONFIG_EFI_PARTITION is not set
 CONFIG_DEFAULT_DEVICE_TREE="socfpga_cyclone5_mcvevk"