anv: Make AUX table invalidate a PIPE_* bit

anv: Make AUX table invalidate a PIPE_* bit

This commit moves it in with all the other cache invalidation operations
as if it were done by PIPE_CONTROL even though it's a pair of register
writes.  This means we only have to write the GFX_AUX_TABLE_BASE_ADDR
register once at device initialization instead of every invalidate.
Invalidates are now a single LRI instead of two.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3519>