ia64: add __NR_old_getpagesize in uapi header file

sys_getpagesize entry is present in kernel/entry.S file to
support for old user interface. So we need to add an uapi
entry too.

Add __NR_old_getpagesize in uapi/asm/unistd.h in order to
not break old user space as it is reserved for backwards
compatibility with old __NR_getpagesize.
Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/include/uapi/asm/unistd.h

@@ -161,7 +161,7 @@
 #define __NR_nanosleep			1168
 #define __NR_nfsservctl			1169
 #define __NR_prctl			1170
-/* 1171 is reserved for backwards compatibility with old __NR_getpagesize */
+#define __NR_old_getpagesize		1171
 #define __NR_mmap2			1172
 #define __NR_pciconfig_read		1173
 #define __NR_pciconfig_write		1174