RFR: 8323748: RISC-V: Add Zfh probe code

[Hamlin Li]

On Sat, 20 Jan 2024 01:32:34 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hi,
>> Can you review this simple patch to add zfh probe code which is a remaining task of [JDK-8318227](https://bugs.openjdk.org/browse/JDK-8318227)?
>> Thanks.
>> 
>> FYI: zfh extension is in the [kernel code](https://github.com/torvalds/linux/blob/master/arch/riscv/include/uapi/asm/hwprobe.h) already.
>
> Looks good (assuming that this works with the latest kernel). Thanks.

Thanks @RealFYang for your reviewing.

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PR Comment: https://git.openjdk.org/jdk/pull/17498#issuecomment-1903662963