intel: Add support for GPU reset status query ioctl

I would have just used the drmIoctl interface directly in Mesa, but the
ioctl needs some data from the drm_intel_context that is not exposed
outside libdrm.

v2: Update based on Mika's kernel work.

v3: Fix compile failures from last-minute typos.  Sigh.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>