[clang] Remove unused-lambda-capture in AArch64.cpp (NFC)

llvm-project/clang/lib/CodeGen/Targets/AArch64.cpp:886:26:
error: lambda capture 'TI' is not used [-Werror,-Wunused-lambda-capture]
  886 |   llvm::sort(Features, [&TI](const StringRef LHS, const StringRef RHS) {
      |                         ~^~
1 error generated.