[jdk21u-dev] RFR: 8313674: (fc) java/nio/channels/FileChannel/BlockDeviceSize.java should test for more block devices

[Amos Shi]

Backport of [JDK-8313674](https://bugs.openjdk.org/browse/JDK-8313674)

Testing
- Local: will do on a Linux `(os.family == "linux")`
- Pipeline: 
- Testing Machine:

-------------

Commit messages:
 - Backport e91492ab4333c61f39b50eb428fa932131a5b908

Changes: https://git.openjdk.org/jdk21u-dev/pull/749/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=749&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313674
  Stats: 36 lines in 1 file changed: 16 ins; 10 del; 10 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/749.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/749/head:pull/749

PR: https://git.openjdk.org/jdk21u-dev/pull/749