Makefile: Enforce ld.lld as a default linker

  GEN     ./Makefile
  HOSTCC  scripts/basic/fixdep
clang-14: error: unable to execute command: Executable "ld" doesn't exist!
clang-14: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [scripts/Makefile.host:102: scripts/basic/fixdep] Error 1