MIPS: ARC: Cleanup unused definitions from sgialib.h

Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
Cc: linux-mips <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/979/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>