anv/device: Work around the i915 kernel driver timeout bug

anv/device: Work around the i915 kernel driver timeout bug

There is a bug in some versions of the i915 kernel driver where it will
return immediately if the timeout is negative (it's supposed to wait
indefinitely).  We've worked around this in mesa for a few months but never
implemented the work-around in the Vulkan driver.

I rediscovered this bug again while working on Ivy Bridge becasuse the
drive in my Ivy Bridge currently has Fedora 21 installed which has one of
the offending kernels.