RFR: 2662: Update the src/hotspot/cpu mailing list rules for hotspot-runtime files

[David Holmes]

Please review this update to the src/hotspot/cpu mailing list rules for hotspot-runtime files.

Thanks

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Commit messages:
 - SKARA-2662

Changes: https://git.openjdk.org/skara/pull/1750/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1750&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2662
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1750.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1750/head:pull/1750

PR: https://git.openjdk.org/skara/pull/1750