ARROW-8770: [C++][CI] Enable arrow-csv-test on s390x
ARROW-8770: [C++][CI] Enable arrow-csv-test on s390x

This PR enables arrow-csv-test on TravisCI on s390x. This testsuite can pass with the latest master.

Closes #7152 from kiszk/ARROW-8770

Authored-by: Kazuaki Ishizaki <409019bab0e07036ad6abfa289bcfe098eb16317@jp.ibm.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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