radv: don't fast clear HTILE for 16-bit depth surfaces on GFX8

This causes rendering issues in Shadow Warrior 2 with DXVK.

Cc: mesa-stable@lists.freedesktop.org
Fixes: ccc64f31 ("radv: enable TC-compat HTILE for 16-bit depth surfaces on GFX8")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106912


Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit 51e23d34)