[TPM] Revert TPM over FFA revision changes

[kuqin12]

Description

Some OS versions used in special environments are not ready for this change. Thus we need to revert the breaking change.

For details on how to complete these options and their meaning refer to CONTRIBUTING.md.

• Impacts functionality?
• Impacts security?
• Breaking change?
• Includes tests?
• Includes documentation?

How This Was Tested

This change is being tested.

Integration Instructions

Change the PcdTpm2AcpiTableRev back to 4.

[mu-automation]

⏩ QEMU Validation Skipped

The PR was merged before validation completed.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/202511@e973ac8). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
SecurityPkg/Tcg/Tcg2AcpiFfa/Tcg2AcpiFfa.c	0.00%	9 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             release/202511   #1797   +/-   ##
================================================
  Coverage                  ?   1.59%           
================================================
  Files                     ?     160           
  Lines                     ?   37728           
  Branches                  ?     172           
================================================
  Hits                      ?     601           
  Misses                    ?   37127           
  Partials                  ?       0           

Flag	Coverage Δ
SecurityPkg	1.59% <0.00%> (?)

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