.flake8: fix check for 80/132 columns

.flake8: fix check for 80/132 columns

We recommend wrapping at 80 columns but we accept 132 columns when it
makes more readable.

When running flake8 locally, use maximum line length 80.
But when running in GitLab CI, keep the check-flake8 job failing only
for lines longer than 132.

Reported-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>