[llvm] [ARM][AArch64] autogenerate header file for TargetParser from Target tablegen files (PR #88378)

[via llvm-commits]

lateautumn233 wrote:

```
llvm-tblgen: Unknown command line argument '-gen-arm-target-def'.  Try: '/home/quqiu/dev/tc-build/build/llvm/bootstrap/bin/llvm-tblgen --help'                                                          llvm-tblgen: Did you mean '--gen-riscv-target-def'?
``` 

It should also be added for llvm-tblgen

https://github.com/llvm/llvm-project/pull/88378