ci/build: fix ppc64le and s390x jobs rules
I think these were written with the idea of making it "(build rules) && (any relevant driver), but instead the driver rules are bypassing the build rules because
- it's not an AND, it's an OR; any line that matches applies, and
- the driver rules are
when: on_success
when these need to bewhen: manual
like the rest of the build jobs.
Let's stop trying to be special and simply behave like all the other build jobs.
We can always try making complex rules later, but once we're on a base that works.