RFR: 8343475: RISC-V: Test TestAESIntrinsicsOnUnsupportedConfig.java fails

[SendaoYan]

Hi all,
Test `test/hotspot/jtreg/compiler/cpuflags/TestAESIntrinsicsOnUnsupportedConfig.java` fails on linux-riscv64, the expected output is: 
`warning: AES instructions are not available on this CPU`
or:
`warning: AES intrinsics are not available on this CPU`
But the actual output on linux-riscv64 both is:
`warning: AES intrinsics require Zvkn extension (not available on this CPU).`

This PR adopt the output for linux-riscv64. The change has been verified locally, test-fix only, no risk.

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

Commit messages:
 - 8343475: RISC-V: Test TestAESIntrinsicsOnUnsupportedConfig.java fails

Changes: https://git.openjdk.org/jdk/pull/21849/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21849&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343475
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21849.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21849/head:pull/21849

PR: https://git.openjdk.org/jdk/pull/21849