firmware: de-dup firmware list parsing

Edit: There were four copies of the same logic to keep in sync;
Originally this patch deduplicated each file, but leaving a copy of
the new function in each, thus reducing the duplication but not
eliminating it. A later patch moved it into a shared function file
following further enhancements to the code in question. This has
since been revised to have the function moved to a shared file here,
which simplifies and gives a cleaner diff.

Gbp-Dch: Short
Closes: #952908

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