UefiPkg/PiSmmCpuDxeSmm: Set SmmProfile Variable only for SMM Mode.

[yanxinzh]

For PiSmmCpuDxeSmm driver. There is SetVariable logic for SmmProfile data. In traditional SMM Mode, still set the SmmProfile variable. But for standalone remove the SetVariable logic.

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[jiaxinwu]

please also update the commit message:

UefiPkg/PiSmmCpuDxeSmm: Set SmmProfile Variable only for DXE SMM

Some platforms plan to move the Standalone MM CPU driver into the FSP.
However, there is no variable service support in FSP. Therefore, the
SetVariable logic for the Standalone MM CPU will be removed. With this
change, users can dump the SmmProfile data from the Memory Allocation
HOB: gMmProfileDataHobGuid.

This change does not impact the DXE SMM, which will still retrieve the
SmmProfile data from the variable service.

Signed-off-by: yanxinzh [email protected]