radv: fix non-0 based layer clears.
If the layer base was > 0, it wasn't getting passed as the start instance or getting added in the shaders. Fixes CTS dEQP-VK.api.image_clearing.core.clear_color_attachment.2d_r8_uint_multiple_layers Fixes: 7e0382fb (radv: add support for layered clears (v2)) Reviewed-by:Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Signed-off-by:
Dave Airlie <airlied@redhat.com>