[clang][lex] NFCI: Use DirectoryEntryRef in ModuleMap::inferFrameworkModule()

This patch changes the argument type of `ModuleMap::inferFrameworkModule()` from `const DirectoryEntry *` to `DirectoryEntryRef` in order to remove the deprecated uses of `DirectoryEntry::getName()`.

Depends on D127647.

Reviewed By: bnbarham

Differential Revision: https://reviews.llvm.org/D127648

GitOrigin-RevId: 95279d7670cd54a50cf72d1fbc99701ef1faa72b