Adds a new library instance to support logging performance data in
Standalone MM.
- Add StandaloneMmPerformanceLib instance
- Move common MM logic to a new file `SmmPerformanceLibInternal.c`
- Since the library largely defers most logic to the performance
measurement protocol a large degree of code can be shared between
Standalone MM and Traditional MM.
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
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