Don't use pinned memory when unnecessary (#17832)

Reports of excessive GPU memory usage and errors
from cudaHostRegister. There are some cases where pinning is
not required.

bench-streamer/src/main.rs

@@ -92,6 +92,7 @@ fn main() -> Result<()> {
             recycler.clone(),
             "bench-streamer-test",
             1,
+            true,
         ));
     }