drm/i915: Fixup 64bit divides in timelines selftest

drm/i915: Fixup 64bit divides in timelines selftest

Some 64b divides snuck in when doing the prng timing compensation.

Fixes: 890f9a85ae23 ("drm/i915: Squash repeated awaits on the same fence")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170513094154.3581-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>