i965/drm: s/drm_intel/drm_bacon/g

i965/drm: s/drm_intel/drm_bacon/g

Using drm_intel_* as a prefix is hazardous - we don't want to conflict
with the actual libdrm_intel symbols.  In particular, I think we could
get into trouble during the final megadrivers linking.

So, rename everything to an different yet arbitrary prefix.  bacon and
intel are the same number of characters, so we don't have to reindent
the world.  It's also an homage to Ian's "Bacon Trail" platform.

I was going to use "drm_relic" to poke fun at libdrm being ancient,
and so we could explain the name with a "historical reasons" pun,
but it sounds too much like ralloc.

Acked-by: Jason Ekstrand <jason@jlekstrand.net>