panfrost: Add various helpers to simplify FB desc emission

panfrost: Add various helpers to simplify FB desc emission

Now that image and image views are gallium-agnostic and contain enough
information, we can provide generic helpers to emit FB descriptors and
their dependencies, thread storage and tiler descriptors.

This helpers will be re-used in the Vulkan driver.

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/10033>