[IA64-SGI] convert some sn SAL_CALLs to ia64_sal_oemcall calls

Convert some sn SAL_CALLs to ia64_sal_oemcall calls so that they can be
called by kernel modules.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>