sparc/config is shared with sparc64, so move it to
kernelarch-sparc/config where it will be automatically used for both
of them.
sparc/config.sparc64 and sparc/config.sparc64-smp are also shared, so
move them to kernelarch-sparc/config-up and
kernelarch-sparc/config-smp respectively.
svn path=/dists/trunk/linux/; revision=21267