selftests/bpf: Test resolve_btfids arena argument suffixes

Add a suffix-only kfunc declaration with arena annotations on all five
arguments. Verify that resolve_btfids emits address_space(1) type tags
for every position without KF_ARENA_ARG flags in the BTF ID sets.

Represent expected arena arguments as a per-parameter bitmap so the
test covers suffixes beyond the two positions expressible by flags.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://patch.msgid.link/20260812193842.2879226-3-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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