Now that they uses -mcpu, its better to have tune specific build
directories, since aarch64 wont be appropriate any longer
(From OE-Core rev: 030cd9021ef50d71482f6acf0e05fe425038c822)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>