[IA64-SGI] One new use of "UNCACHED" needed fixing for sn2 region cleanup

Some shub2 changes were not in the tree when Greg cleaned up the sn2
region definitions in 1b66776da71e33dff5edcc0b096ec3b7c40c75ad, so this
one didn't get fixed.

Signed-off-by: Tony Luck <tony.luck@intel.com>

include/asm-ia64/sn/addrs.h

@@ -258,7 +258,7 @@
 
 /* Shub1 TIO & MMR addressing macros */
 #define SH2_TIO_IOSPACE_ADDR(n,x)					\
-	((UNCACHED | REMOTE_ADDR(n,x) | 1UL << (NASID_SHIFT - 2)))
+	((__IA64_UNCACHED_OFFSET | REMOTE_ADDR(n,x) | 1UL << (NASID_SHIFT - 2)))
 
 #define SH2_REMOTE_MMR(n,x)						\
 	GLOBAL_MMR_ADDR(n,x)