bugfix: fix Intel DRAM overflow issue

[slabasan]

Description

This patch fixes an overflow problem with Intel's DRAM energy register. Code now checks if the difference in the raw bits is negative, instead of the difference in the joule value.

This still needs testing on a long running application to confirm the problem is resolved.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature/architecture support (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Build/CI update

How Has This Been Tested?

• Comus, spin loop

Checklist:

• I have run ./scripts/check-code-format.sh and confirm my C/C++ code follows the style guidelines of variorum
• I have run flake8 and black --check --diff and confirm my python code follows the style guidelines of variorum
• I have run ./scripts/check-rst-format.sh and confirm my documentation follows the style guidelines of variorum
• I have added comments in my code
• My changes generate no new warnings (build with -DENABLE_WARNINGS=ON)
• New and existing unit tests pass with my changes

[tpatki]

@slabasan I am not sure where we left this after we discovered this in Jessica's data. Do you think we can get this merged in with v0.7, mostly because it impacts correctness?

[tpatki]

@slabasan : Shall we mark this as "won't-fix" or close this?