[llvm] [NFC][RISCV] Move Zvfbf* relative stuffs to RISCVInstrInfoZvfbf.td (PR #159619)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx-nvidia-win` running on `as-builder-8` while building `llvm` at step 6 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/54/builds/12955

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (build-unified-tree) failure: build (failure)
...
[491/2807] Linking CXX static library lib\LLVMDebugInfoBTF.lib
[492/2807] Building CXX object utils\TableGen\Common\CMakeFiles\obj.LLVMTableGenCommon.dir\GlobalISel\GlobalISelMatchTable.cpp.obj
[493/2807] Linking CXX static library lib\LLVMRemarks.lib
[494/2807] Linking CXX static library lib\LLVMOrcShared.lib
[495/2807] Building AArch64TargetParserDef.inc...
[496/2807] Linking CXX static library lib\LLVMTableGenCommon.lib
[497/2807] Linking CXX shared library bin\Remarks.dll
[498/2807] Linking CXX executable bin\llvm-opt-report.exe
[499/2807] Linking CXX executable bin\llvm-remarkutil.exe
[500/2807] Building RISCVTargetParserDef.inc...
FAILED: include/llvm/TargetParser/RISCVTargetParserDef.inc C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/build/include/llvm/TargetParser/RISCVTargetParserDef.inc 
cmd.exe /C "cd /D C:\buildbot\as-builder-8\llvm-nvptx-nvidia-win\build\include\llvm\TargetParser && C:\buildbot\as-builder-8\llvm-nvptx-nvidia-win\build\NATIVE\bin\llvm-min-tblgen.exe -gen-riscv-target-def -IC:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/include/llvm/TargetParser -IC:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/lib/Target/RISCV -IC:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/build/include -IC:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/include --long-string-literals=0 C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/lib/Target/RISCV/RISCV.td --write-if-changed -o C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/build/include/llvm/TargetParser/RISCVTargetParserDef.inc"
Included from C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/lib/Target/RISCV/RISCV.td:36:
Included from C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/lib/Target/RISCV\RISCVInstrInfo.td:2344:

Included from C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/lib/Target/RISCV\RISCVInstrInfoV.td:1842:

C:/buildbot/as-builder-8/llvm-nvptx-nvidia-win/llvm-project/llvm/lib/Target/RISCV\RISCVInstrInfoZvfbf.td:39:19: error: Variable not defined: 'HasStdExtZvfbfmin'

let Predicates = [HasStdExtZvfbfmin] in {

                  ^

[501/2807] Linking CXX executable bin\llvm-tblgen.exe
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/159619