intel: Drop aub dumping functionality

We now have a separate tool for this in intel-gpu-tools and we don't
need to clutter up libdrm with this feature. We leave the entry points
in there to avoid breaking API/ABI.

Install intel-gpu-tools, then run (for example)

    $ intel_aubdump --output=trace.aub glxgears -geometry 500x500

See the intel_aubdump man page for more details.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Kristian Høgsberg Kristensen <kristian.h.kristensen@intel.com>