CVE-2017-5754

BugLink: http://bugs.launchpad.net/bugs/1742772

This patch chnages the fallback flush to load all ways of a set,
then move to the next set. This is the best way to flush the cache,
accoring to HW people.
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>