RFR: 8322209: RISC-V: Enable some tests related to MD5 instrinsic

[Hamlin Li]

Hi,
Can you review this simple patch to enable some tests for MD5 instrinsic?
Thanks!

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

Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/17126/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17126&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322209
  Stats: 5 lines in 2 files changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17126.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17126/head:pull/17126

PR: https://git.openjdk.org/jdk/pull/17126