We have a few drivers that want to include shubio.h, like mmtimer and the xp* 
drivers.  Moving it from arch/ia64/sn/include to include/asm-ia64/sn makes it 
a little easier for drivers to get at.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>