freedreno/a6xx: Add LRZ-fighting workaround
The app has a z-fighting sort of issue with LRZ, where as a result of a later draw with very close depth value a needed earlier draw gets occluded. See #8065.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8065 Signed-off-by: Rob Clark robdclark@chromium.org