Revert "limit metal buffers and revert the 207 fix (#2087)"

This reverts commit 2fb10f6a19.

test/test_schedule.py

@@ -326,11 +326,5 @@ class TestSchedule(unittest.TestCase):
     out = x.to('cpu')
     check_schedule(out, 0, filter_loadops=False)
 
-  @unittest.skipUnless(Device.DEFAULT == "METAL", "only for metal")
-  def test_metal_limit_buffers(self):
-    t = sum([Tensor([1,2,3,4]) for _ in range(40)])
-    for si in t.lazydata.schedule():
-      assert len(si.inputs) <= 30
-
 if __name__ == '__main__':
   unittest.main(verbosity=2)