v3dv: take memory format from appropriate miplevel for image load/store

v3dv: take memory format from appropriate miplevel for image load/store

We were storing the format of the base miplevel in the image view and
we were typically using that instead of the taking the format from
the appropriate image slice. This was a problem when loading or storing
a miplevel other than the base which happened to have a different format.

This also removed the tiling field from the image view to avoid repeating
the same mistake in the future.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>