anv: Canonicalize buffer formats for image/buffer copies

anv: Canonicalize buffer formats for image/buffer copies

Some formats, in particular YCbCr formats and ASTC have additional
restrictions.  We already whack ASTC formats to RGBA32_UINT because the
hardware doesn't allow LINEAR with ASTC.  However, we need to fix YCbCr
formats as well because they come with alignment restrictions that we
can't guarantee are satisfied.  We're using blorp_copy to do the copies
so we may as well just stomp formats for everything.

Fixes: b24b93d5843 "anv: enable VK_KHR_sampler_ycbcr_conversion"
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3460>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3460>