tests/functional/aarch64/test_rme_sbsaref: Silence issues reported by pylint

Drop unused import and use an encoding for open().

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20251119082636.43286-15-thuth@redhat.com>
1 file changed