Since the CCU only gets used for unaligned attachment stores or resolves
with the wrong formats, we can use that space for attachments in many
cases.
This gets two more of vk-5-normal's main renderpass's attachments to fit
in the next gmem_pixels increment, leaving 1 to go. Other renderpasses do
get better gmem_pixels, and a few get better tile sizes as a result, but
the fps increase from those looks to be <.2% at least.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16921>
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