Set correct HDLC addresses after loading BE firmware

Description

The HDLC addresses for each VFAT are set to their correct values, which is 0 for GE1/1 and equal to the VFAT number for GE2/1. Issue documented here.

Related Issue

Closes #188 (closed).

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.