Remove outdated AArch64 RzAsm plugin from binutils

[XVilka]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

After Capstone auto-sync is completed for AArch64 this plugin is unnecessary now.

Test plan

CI is green

Closing issues

• Partially addresses Remove all globals & static variables where possible #4055
• Partially addresses Rewrite GPL-only code #2704
• Partially addresses Update binutils code to the latest binutils #814

[Rot127]

<3

[XVilka]

NetBSD CI is flaky today, rz-bindgen worker error is unrelated:

 /usr/bin/python3 ../src/main.py -o . --clang-path /usr/lib/llvm-14/lib --clang-args ' -resource-dir="/usr/lib/llvm-14/lib/clang/14.0.0"' --rizin-include-path /usr/include/librz --targets SWIG
Warning:  Ignored fields on class RzIO do not exist: priv_w32dbg_wrap
Traceback (most recent call last):
  File "/home/runner/work/rizin/rizin/rz-bindgen/build/../src/main.py", line 57, in <module>
    generator_swig.generate(output_dir)
  File "/home/runner/work/rizin/rizin/rz-bindgen/src/generator_swig.py", line 37, in generate
    write(Writer(output_file))
  File "/home/runner/work/rizin/rizin/rz-bindgen/src/generator_swig.py", line 61, in write
    write_class(writer, cls)
  File "/home/runner/work/rizin/rizin/rz-bindgen/src/generator_swig.py", line 211, in write_class
    decl = stringify_decl(field.name, field.ctype)
  File "/home/runner/work/rizin/rizin/rz-bindgen/src/generator_swig.py", line 165, in stringify_decl
    return f"{class_structs[ctype.decl_spelling].name} {expr}"
KeyError: 'rz_analysis_esil_inter_state_t'