[REBASE ON MERGE] Fix Incorrect mHighAddress Calculation

[os-d]

Description

Fix an error made in the AdvLogger v5 PR (#471). This is the same fix (but for a different variable name which is why it was mixed on the last fix up) as #483.

Usage of mHighAddress (and mMaxAddress) will be evaluated as part of issue #474.

• Impacts functionality?
  • Functionality - Does the change ultimately impact how firmware functions?
  • Examples: Add a new library, publish a new PPI, update an algorithm, ...
• Impacts security?
  • Security - Does the change have a direct security impact on an application,
    flow, or firmware?
  • Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
• Breaking change?
  • Breaking change - Will anyone consuming this change experience a break
    in build or boot behavior?
  • Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
• Includes tests?
  • Tests - Does the change include any explicit test code?
  • Examples: Unit tests, integration tests, robot tests, ...
• Includes documentation?
  • Documentation - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  • Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

Tested on Q35, LineParserTestApp was failing because of this.

Integration Instructions

N/A for a platform. For the next Mu integration, this should be combined with the Advanced Logger v5 commit be9a3d2.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.86%. Comparing base (a9e42d6) to head (b50ebc1).

Additional details and impacted files

@@               Coverage Diff               @@
##           release/202311     #484   +/-   ##
===============================================
  Coverage           10.86%   10.86%           
===============================================
  Files                 142      142           
  Lines               22379    22379           
  Branches             1808     1808           
===============================================
  Hits                 2431     2431           
  Misses              19916    19916           
  Partials               32       32           

Flag	Coverage Δ
AdvLoggerPkg	3.71% <ø> (ø)

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