gPTP Fixes and Improvements

[kencarlino]

Here is another set of fixes and improvements for gPTP with the focus on the automotive profile. See the list of commits for more information about what is changed.

[andrew-elder]

This looks ok to me. Is anyone in a position to run it?

[pinealservo]

I am (will be) in a position to run it; I'm in the middle of a long-run test right now, so I'll try it tomorrow.

[pinealservo]

I don't know why we would ever want a sync receipt timer running while we're grandmaster. Should probably be deleted unless someone knows a good reason for it to continue to stick around as a comment.

[pinealservo]

Ugh, my comments aren't really on outdated diffs; I was just viewing a commit at a time. In any case, I didn't find anything that would prevent merging, I just looked into some of the "TODO" commented out code, so you might want to un-collapse and look at my previous comments.

I have run it in both normal and automotive profile mode, and it seems to be working correctly, though I haven't run exhaustive tests.

[pinealservo]

Thanks for cleaning up that comment, @kencarlino. I think we've had enough eyes on this now, and I've verified basic functionality in both standard and automotive profile mode.

[andrew-elder]

Thanks for merging @pinealservo!