[Go][CI] Add Travis CI job for Go on s390x

[asfimport]

As suggested in #8011, add a Travis CI job for Go on s390x.

Reporter: Vivian Kong / @vivkong
Assignee: Vivian Kong / @vivkong

PRs and other links:

• GitHub Pull Request #8047

_{Note: This issue was originally created as ARROW-9844. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 8047
#8047