iris: Extend the cache tracker to handle L3 flushes and invalidates

iris: Extend the cache tracker to handle L3 flushes and invalidates

Most clients are L3-coherent these days.  However, there are some
notable exceptions, such as push constants, stream output, and command
streamer memory reads and writes.

With the advent of the tile cache, flushing the render or depth caches
alone are no longer sufficient for memory to become globally-observable.
For those, we need to flush the tile cache as well.  However, we'd like
to avoid that for L3-coherent clients, as it shouldn't be necessary,
and is expensive.

Reviewed-by: Rohan Garg <rohan.garg@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15275>