v3d: Don't set the first_ez_state to DISABLED if after only UNDECIDED draws.

We need to have the RCL start with EZ enabled, since those undecided draws
had EZ enabled.  But we do need to update from UNDECIDED to LT or GT as
necessary still.

Fixes many simulator assertion fails in deqp
fragment_ops/interaction/basic_shader/*

src/gallium/drivers/v3d/v3dx_draw.c

@@ -371,7 +371,8 @@ v3d_update_job_ez(struct v3d_context *v3d, struct v3d_job *job)
                 job->ez_state = VC5_EZ_DISABLED;
         }
 
-        if (job->first_ez_state == VC5_EZ_UNDECIDED)
+        if (job->first_ez_state == VC5_EZ_UNDECIDED &&
+            (job->ez_state != VC5_EZ_DISABLED || job->draw_calls_queued == 0))
                 job->first_ez_state = job->ez_state;
 }