RFR: 8367137: RISC-V: Detect Zicboz block size via hwprobe

[Dingli Zhang]

Hi,
Can you help to review this patch? Thanks!

We can extends RISC-V hwprobe support to include `RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`.
The probed value is recorded in VM_Version::zicboz_block_size and then used to set the global CacheLineSize.
This ensures correct usage of the Zicboz extension, as block zeroing instructions operate on cache-line granularity.

FYI: https://docs.kernel.org/arch/riscv/hwprobe.html

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Commit messages:
 - fix typo
 - RISC-V: Add riscv_hwprobe syscall for zicboz block size

Changes: https://git.openjdk.org/jdk/pull/27155/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27155&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367137
  Stats: 51 lines in 3 files changed: 11 ins; 0 del; 40 mod
  Patch: https://git.openjdk.org/jdk/pull/27155.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27155/head:pull/27155

PR: https://git.openjdk.org/jdk/pull/27155