igt/evictions: Avoid getting killed by the reaper in mlock

We're little bit too enthusiastic in our initial attempt to lock all
available memory. Let's use the mlock probe from lib rather than trying
to lock everything that sysinfo.freeram has to offer.
Note that we're only tweaking the initial step - it's still possible
that we're going to get killed later on.

v2: Just increment lock instead of modifying addr passed to mlock

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ewelina Musial <ewelina.musial@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ewelina Musial <ewelina.musial@intel.com>

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