[FF-A][TPM] Updates for ArmFfaLib to not use global variable pre-memory#1618

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Raymond-MS wants to merge 2 commits intomicrosoft:release/202502from

Raymond-MS:personal/rdiaz/TcgStartupLib

Commits on Jan 28, 2026

Removed global variables in ArmFfaCommon. Moved the globals to locals in each phase's ArmFfaLib implementation. SEC and PEI will query when necessary to avoid setting globals when memory is unavail…
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Add Unmap callback for when PEI and SEC need to invalidate the Rx/Tx buffer HOB on a call to Unmap.
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