Remove TempPreUefiEventLogLib since Tcg2PreUefiEventLogLibNull is ava…

…ilable (#236)

## Description

The TempPreUefiEventLogLib is an instance of the Tcg2PreUefiEventLogLib,
but it contains an assert for when the library instance is used.

Tcg2PreUefiEventLogNull is now available. TempPreUefiEventLogLib is no
longer necessary to allow builds to complete.

Remove the TempPreUefiEventLogLib instance of TempPreUefiEventLogLib.

- [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, ...
- [x] 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

- CI 
- Local build of platform with included change. 

## Integration Instructions

Dsc files that made use of TempPreUefiEventLogLib need to update to
point to the Tcg2PreUefiEventLogLibNull library instance.

SecurityPkg/SecurityPkg.dsc

@@ -272,7 +272,6 @@
   SecurityPkg/Library/PlatformSecureLibNull/PlatformSecureLibNull.inf
   SecurityPkg/Library/Tcg2PpVendorLibNull/Tcg2PpVendorLibNull.inf
   SecurityPkg/Library/TcgPpVendorLibNull/TcgPpVendorLibNull.inf
-  SecurityPkg/Library/TempPreUefiEventLogLib/TempPreUefiEventLogLib.inf
   SecurityPkg/Library/Tpm2DebugLib/Tpm2DebugLibNull.inf
   SecurityPkg/Library/Tcg2PhysicalPresencePromptLib/Tcg2PhysicalPresencePromptLibConsole.inf
   SecurityPkg/Library/Tcg2PreUefiEventLogLibNull/Tcg2PreUefiEventLogLibNull.inf