Revert a commit in ipxe that breaks Mellanox NICs (#116)

## Description

This would update iPXE to the latest master plus a revert of a commit identified to break Mellanox NICs.
This is a temporary measure that might need to be repeated on future updates of iPXE until ipxe/ipxe#1091 has been fixed correctly.

## Why is this needed

Relates to: #115, ipxe/ipxe#1091

## How Has This Been Tested?

I did repeated testing of iPXE binaries from my branches
[mainline-ipxe](https://github.com/nshalman/ipxedust/tree/mainline-ipxe)
[test-revert](https://github.com/nshalman/ipxedust/tree/test-revert)
to confirm that the issue exists and is addressed by the revert.

## How are existing users impacted? What migration steps/scripts do we need?

This would unbreak users of certain Mellanox NICs (Definitely Mellanox CX4, possibly others too)

## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

binary/script/ipxe.commit

@@ -1 +1 @@
-115707c0edebad65f87525fed583fef73880016d
+fbc3b4a104698658202c2a83217ca8722453bf49