Revert "panfrost: Z24 variants should be sampled as R32UI"

Revert "panfrost: Z24 variants should be sampled as R32UI"

Commit 0406ea485649 ("panfrost: Z24 variants should be sampled as
R32UI") causes a regression when depth textures are sampled.

It's still not clear how MALI_Z32 can work for for Z32 and Z24{S,X}8,
but let's leave that question for later.

Reported-by: Icecream95 <ixn@keemail.me>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4101>