configs: imx8mn_bsh_smm_s2: add UBI commands

imx8mn_bsh_smm_s2 uses ubifs rootfs, UBI commands are required to flash
it.

Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
diff --git a/configs/imx8mn_bsh_smm_s2_defconfig b/configs/imx8mn_bsh_smm_s2_defconfig
index 08f52e5..f8c75a2 100644
--- a/configs/imx8mn_bsh_smm_s2_defconfig
+++ b/configs/imx8mn_bsh_smm_s2_defconfig
@@ -43,6 +43,7 @@
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=gpmi-nand"
 CONFIG_MTDPARTS_DEFAULT="gpmi-nand:64m(nandboot),16m(nandfit),32m(nandkernel),1m(nanddtb),8m(nandtee),-(nandrootfs)"
+CONFIG_CMD_UBI=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y