RFR: 8376152: Test javax/sound/sampled/Clip/bug5070081.java timed out then completed

[Phil Race]

I've run this test and it definitely needs a sound device.
So I've added the jtreg key for sound, so we can always run it where there's sound support.

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Commit messages:
 - 8376152
 - 8376152

Changes: https://git.openjdk.org/jdk/pull/29901/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29901&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376152
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29901.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29901/head:pull/29901

PR: https://git.openjdk.org/jdk/pull/29901