i965: Track format and aux usage in the render cache

This lets us perform render cache flushes whenever a surface goes from
being used with one aux+format to a different aux+format.

This is the "proper" fix for https://bugs.freedesktop.org/102435.
ee57b15e which was really just a partial
revert of 3e57e949 was just a hack to
get rid of a hang in a bunch of Valve games.  This solves the actual
problem responsible for the hang and lets us enable CCS_E once again.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102435


Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: "17.3" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit d84275b8)