install mReadOnlyVariableThunkPresent PPI to insure that only one ReadOnlyVariable thunk driver can be present in the platform.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5337 6f19259b-4bc3-4df7-8a09-765794883524
2 files changed