Add clang-cross to sysroot via POPULATESYSROOTDEPS to get llvm tools
e.g. llvm-strip, llvm-nm etc when they are used at default STRIP/NM etc.
(From OE-Core rev: 0d239586ec2f258a42d60f9fb6a058344516218a)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>