Addeding dTPM support for MM Core module type (#259)

# Preface

Please ensure you have read the [contribution
docs](https://github.com/microsoft/mu/blob/master/CONTRIBUTING.md) prior
to submitting the pull request. In particular,
[pull request
guidelines](https://github.com/microsoft/mu/blob/master/CONTRIBUTING.md#pull-request-best-practices).

## Description

The current dTPM library instance only supports MM_STANDALONE, which
makes the MM core module unable to use this instance.

This change expands the support for this library to cover
MM_CORE_STANDALONE as well.

For each item, place an "x" in between `[` and `]` if true. Example:
`[x]`.
_(you can also check items in the GitHub UI)_

- [x] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

## How This Was Tested

This was tested on QEMU Q35 and verified bootable to UEFI shell.

## Integration Instructions

N/A

SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmStandaloneMm.inf

@@ -22,7 +22,7 @@
   FILE_GUID                      = 9A5DB21A-FF0B-46D0-8672-B4F83FEF1F0E
   MODULE_TYPE                    = BASE
   VERSION_STRING                 = 1.0
-  LIBRARY_CLASS                  = Tpm2DeviceLib|MM_STANDALONE
+  LIBRARY_CLASS                  = Tpm2DeviceLib|MM_STANDALONE MM_CORE_STANDALONE # MU_CHANGE
   CONSTRUCTOR                    = Tpm2DeviceLibConstructor
 
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