[MC][RISCV] Add missing Predicates for NDS_FMV_BF16_X (#169662)
run
```shell
build/bin/llvm-exegesis -mode=latency -mtriple=riscv64-unknown-linux-gnu --mcpu=generic --benchmark-phase=assemble-measured-code -opcode-index=-1
```
error:
```
---
mode: latency
key:
instructions:
- 'NDS_FMV_BF16_X F2_H X11'
- 'NDS_FMV_X_BF16 X26 F2_H'
config: ''
register_initial_values:
- 'X11=0x0'
cpu_name: generic
llvm_triple: riscv64-unknown-linux-gnu
min_instructions: 10000
measurements: []
error: actual measurements skipped.
info: Repeating two instructions
assembled_snippet: 41116AE48145538105F0530D01E0538105F0530D01E0538105F0530D01E0538105F0530D01E0226D41018280
...
LLVM ERROR: Attempting to emit FMV_H_X instruction but the Feature_HasHalfFPLoadStoreMove predicate(s) are not met
```
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