[RISCV] Implement load/store support for XAndesBFHCvt (#150350)

We use `lh` to load 2 bytes from memory into a gpr, then mask this gpr
with -65536 to emulate nan-boxing behavior, and then the value in gpr is
moved to fpr using `fmv.w.x`.
To move the value back from fpr to gpr, we use `fmv.x.w` and finally,
`sh` is used to store the lower 2 bytes back to memory.

If zfh is enabled at the same time, we can just use flh/fsw to
load/store bf16 directly.

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