[LLVM][CMake][NFC] Resolve FIXME: Rename LLVM_CMAKE_PATH to LLVM_CMAKE_DIR throughout the project This way, we do not need to set LLVM_CMAKE_PATH to LLVM_CMAKE_DIR when (NOT LLVM_CONFIG_FOUND) Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D107717 GitOrigin-RevId: a2c319fdc6b35ae6d8578459f07c89042775e5ec