iris: Add read-write domain for data cache.

iris: Add read-write domain for data cache.

This will allow us to remove the history flushes performed for SSBOs
and instead take advantage of the same mechanism used for tracking
other memory accesses.

v2: Use C99 designated initializers (Ken).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12691>