radv/gfx10: fix 3D images

GFX10 does act like GFX9 actually.

This fixes
dEQP-VK.glsl.texture_functions.query.texturesize.*sampler3d_*.

Cc: 19.2 <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit 9c92a21f)