Improve the layout code, based in part on the Asahi/Intel layout.
Suffixes like `_px` (for pixel), `_B` (for byte), `_el` (for element)
and `_sb` (for superblock) make some of the sizes of items within the
layout more explicit.
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Ryan Mckeever <ryan.mckeever@collabora.com>
Reviewed-by: Olivia Lee <olivia.lee@collabora.com>
Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34767>
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