RFR: 8350931: RISC-V: remove unnecessary src register for fp_sqrt_d/f

[Hamlin Li]

Hi,
Can you review this simple patch?
It remove the unnecessary src register for fp_sqrt_d/f pipe_class, as sqrt has only one src register.
Thanks

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/23839/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23839&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350931
  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23839.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23839/head:pull/23839

PR: https://git.openjdk.org/jdk/pull/23839