RFR: 8353695: RISC-V: compiler/cpuflags/TestAESIntrinsicsOnUnsupportedConfig.java is failing with Zvkn

[Fei Yang]

Hi, please review this small change fixing two jtreg tests.
This issue menifests after https://github.com/openjdk/jdk/pull/24344 which auto detests and enables Zvkn extension.
The two tests only requires "aes" feature string (vm.cpu.features ~= ".*aes.*"). But the feature string is "zvkn" for linux-riscv64 platform.
This adapts "@requires" of both tests considering the Zvkn feature of this platform. Both tests works as expected with qemu-system which is equipped with the Zvkn extension.

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Commit messages:
 - 8353695: RISC-V: compiler/cpuflags/TestAESIntrinsicsOnUnsupportedConfig.java is failing with Zvkn

Changes: https://git.openjdk.org/jdk/pull/24433/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24433&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353695
  Stats: 5 lines in 3 files changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/24433.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24433/head:pull/24433

PR: https://git.openjdk.org/jdk/pull/24433