radv: do not use gfx fast depth clears for layered depth/stencil images

The driver should only fast depth clears with the graphics path
when the view covers all image layers, otherwise this might
corrupt layers when HTILE is enabled.

Cc: 19.0 19.1 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 8a35eb06)