Update the register names to the unified firmware release

Description

Change the register names as follow:

• BEFE.GEM.DAQ.EXT_CONTROL -> BEFE.GEM.DAQ.CONTROL
• BEFE.GEM.DAQ.EXT_STATUS -> BEFE.GEM.DAQ.STATUS
• BEFE.GEM.DAQ.STATUS.DAQ_LINK_AFULL -> BEFE.GEM.DAQ.STATUS.DAQ_BACKPRESSURE

For coherency and genericity reasons, the monitorable DAQ_LINK_AFULL was renamed to DAQ_BACKPRESSURE as well.

Related Issue

How Has This Been Tested?

Successfully tested on:

• The ME0 CVP-13 setup
• The GE1/1 integration setup in b904 with the latest firmware builds

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.