Initialize the FRB2 watchdog timer in DXE phase if PEI is not supported.

[ScottieKuo]

Initialize the FRB2 watchdog timer in DXE phase if PEI is not supported.

Description

PEIM driver support was limited on ARM based project and caused FRB2
watchdog timer was not enabled.

Expected Behavior:
FRB2 watchdog timer should be set correctly based on policy.

FIX APPLIED:
Add FRB2 timer running check, if timer is not running and policy is set,
enable FRB2 watchdog timer.

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

Tested with ARM based project and observed the watchdog timer was set
based on policy setting.

Integration Instructions

N/A

[ScottieKuo]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.20%. Comparing base (cbd7225) to head (71dcfd2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
- Coverage   28.32%   28.20%   -0.13%     
==========================================
  Files          44       44              
  Lines        2990     3003      +13     
  Branches      404      404              
==========================================
  Hits          847      847              
- Misses       2131     2144      +13     
  Partials       12       12              

Flag	Coverage Δ
IpmiFeaturePkg	28.20% <ø> (-0.13%)	⬇️

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