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: 86dfa556d9 ("cmd: ubi: Remove useless call to mtdparts_init()")
Signed-off-by: Tom Rini <trini@konsulko.com>