gallium: Redefine the max texture 2d cap from _LEVELS to _SIZE.
The _LEVELS assumes that the max is always power of two. For V3D 4.2, we can support up to 7680 non-power-of-two MSAA textures, which will let X11 support dual 4k displays on newer hardware. Reviewed-by: Marek Olšák <firstname.lastname@example.org>
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