asahi: Compress more texture targets

asahi: Compress more texture targets

They should already work, we just need it enabled. The comment here claimed
(incorrectly) that there is no hardware support for linear 2D arrays. In fact,
there is support, it's just not advertised in the public Metal API. With some
awful tricks, I managed to reverse-engineer the hardware interface and hooked it
up, so we can take advantage of it now.

In fact, we can stop checking the target explicitly at all. The only case where
we can't compress is 1D/buffer textures, which are necessarily less than 16
height so will be dropped in the next check.

When I originally wrote this cuhange, dolphin's MeltyMoltenGalaxy trace with
specialized shaders at 4K was helped from 28fps to 43fps, which is massive :-)

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22891>