bpf: Support struct btf_struct_meta via KF_IMPLICIT_ARGS

The following kfuncs currently accept void *meta__ign argument:
  * bpf_obj_new_impl
  * bpf_obj_drop_impl
  * bpf_percpu_obj_new_impl
  * bpf_percpu_obj_drop_impl
  * bpf_refcount_acquire_impl
  * bpf_list_push_back_impl
  * bpf_list_push_front_impl
  * bpf_rbtree_add_impl

The __ign suffix is an indicator for the verifier to skip the argument
in check_kfunc_args(). Then, in fixup_kfunc_call() the verifier may
set the value of this argument to struct btf_struct_meta *
kptr_struct_meta from insn_aux_data.

BPF programs must pass a dummy NULL value when calling these kfuncs.

Additionally, the list and rbtree _impl kfuncs also accept an implicit
u64 argument, which doesn't require __ign suffix because it's a
scalar, and BPF programs explicitly pass 0.

Add new kfuncs with KF_IMPLICIT_ARGS [1], that correspond to each
_impl kfunc accepting meta__ign. The existing _impl kfuncs remain
unchanged for backwards compatibility.

To support this, add "btf_struct_meta" to the list of recognized
implicit argument types in resolve_btfids.

Implement is_kfunc_arg_implicit() in the verifier, that determines
implicit args by inspecting both a non-_impl BTF prototype of the
kfunc.

Update the special_kfunc_list in the verifier and relevant checks to
support both the old _impl and the new KF_IMPLICIT_ARGS variants of
btf_struct_meta users.

[1] https://lore.kernel.org/bpf/20260120222638.3976562-1-ihor.solodrai@linux.dev/

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260327203241.3365046-1-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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