v3dv: don't be too aggressive disabling early Z

v3dv: don't be too aggressive disabling early Z

When we have a draw call that is incompatible with EZ we should only
disable EZ for the remaining of the job in the case that both of the
following conditions are met:

1. The cause for the incompatibility is an incompatible depth test
   direction.

2. The pipeline does Z writes.

Otherwise it is enough to disable EZ temporarily only for draw calls
with the incompatible pipeline.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16794>