configs: Migrate and re-enabled CONFIG_CMD_MTDPARTS

Now that CMD_UBI does not select CMD_MTDPARTS we need to make platforms
that had been enabling it turn it on by hand.  This exposed that we had
not yet migrated CMD_MTDPARTS fully, so do so now.

Fixes: 86dfa556d927 ("cmd: ubi: Remove useless call to mtdparts_init()")
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/gardena-smart-gateway-mt7688-ram_defconfig b/configs/gardena-smart-gateway-mt7688-ram_defconfig
index 0e2f158..262dea3 100644
--- a/configs/gardena-smart-gateway-mt7688-ram_defconfig
+++ b/configs/gardena-smart-gateway-mt7688-ram_defconfig
@@ -22,6 +22,7 @@
 CONFIG_CMD_SPI=y
 # CONFIG_CMD_NET is not set
 CONFIG_CMD_TIME=y
+CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="spi-nand0=spi-nand0"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-nand0:-(ubi)"
 CONFIG_CMD_UBI=y