RFR: 8332248: (fc) java/nio/channels/FileChannel/BlockDeviceSize.java failed with RuntimeException

[Brian Burkhalter]

Throw `SkippedException` instead of `RuntimeException` when access to a block device is denied.

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Commit messages:
 - 8332248: (fc) java/nio/channels/FileChannel/BlockDeviceSize.java failed with RuntimeException

Changes: https://git.openjdk.org/jdk/pull/19236/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19236&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332248
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19236.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19236/head:pull/19236

PR: https://git.openjdk.org/jdk/pull/19236