link_elf: bounds-check the dynamic section's tables

[ojanerif_amd.com]

Summary

parse_dynamic() only checks the DT_HASH header. nbuckets, nchains and
the other DT_* tables come from the module unchecked. Check them
against the mapping, and reject a size without its table.

Reported by: llm-postcr
MFC after: 1 week