When doing manual format bumps, the upstream version for +20 needs to be
updated to the upstream version in the new format, but since the format
differs, the build will fail.
This PR adds a new flag to `mixer versions update` and to `mixer build`
subcommands that allows this check to be skipped.
Signed-off-by: Rodrigo Chiossi <rodrigo.chiossi@intel.com>