tar: don't mv tar for nativesdk

We move tar into /bin for target but it can stay in /usr/bin for nativesdk
this will also mean the paths are correct for the buildtools-tarball environment

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>