bpf2c should show BPF assembly not names of uBPF specific macros, in comments

### Describe the feature you'd like supported

Today bpf2c generteas comments like:
```
// EBPF_OP_ADD64_IMM pc=526 dst=r1 src=r0 offset=0 imm=-1
```
whereas bpf assembly would be:
```
// add %r1, -1
```

The latter is more consistent with llvm-objdump, bpf_conformance, and other such tools.
It also avoids using a uBPF specific define (EBPF_OP_ADD64_IMM) in bpf2c which shouldn't depend on uBPF.

### Proposed solution

Use BPF assembler syntax in comments instead

### Additional context

_No response_

Start at the bpf2c instruction-comment generation entry point and compare its current macro-based comments with the BPF assembler examples in the issue. Done means generated comments use assembler syntax such as `add %r1, -1` and no longer reference uBPF-specific macro names.

Written by the indexing model from the issue text.