manager: extend performance measurement interface to include firmware/loader times
This only adds the fields to the D-Bus interfaces but doesn't fill them in with anything useful yet. Gummiboot exposes the necessary bits of information to use however and as soon as I get my fingers on a proper UEFI laptop I'll hook up the remaining bits. Since we want to stabilize the D-Bus interface soon and include it in the stability promise we should get the last fixes in, hence this change now.
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