APCB configuration should not include BMC early link training

[wesolows]

The current example blob configuration for Gimlet in amd-host-image-builder leaves intact the Ethanol-X early PCIe link training configuration used to connect with the BMC. This doesn't exist at all on Gimlet and the feature should be disabled in our Gimlet configuration.

[wesolows]

Somehow this was moved to the Done state in the external milestone tracker (which I do not believe should ever be done except by the bot) but is still open here. It looks like there was an attempt to address this via 71bcc95; should this bug be closed? The commit message referenced #76, not this bug, so I can't tell what was intended. All commit messages should include a single line identifying each bug or RFE that it addresses, in the form

repo#bugno verbatim synopsis of the bug from the ticketing system

If the repository is illumos-gate master, the repo# portion should be omitted and a list of reviewers included after the list of tickets; see documentation at illumos.org.

That makes it easy to determine whether a ticket has inadvertently been left open. Has this one, or is there still work to be done?