[IA64] Wire up getrandom() system call

See commit c6e9d6f3
    random: introduce getrandom(2) system call

for all the details (and even a manual page!)
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/include/asm/unistd.h

@@ -11,7 +11,7 @@
 
 
 
-#define NR_syscalls			315 /* length of syscall table */
+#define NR_syscalls			316 /* length of syscall table */
 
 /*
  * The following defines stop scripts/checksyscalls.sh from complaining about

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

@@ -328,5 +328,6 @@
 #define __NR_sched_setattr		1336
 #define __NR_sched_getattr		1337
 #define __NR_renameat2			1338
+#define __NR_getrandom			1339
 
 #endif /* _UAPI_ASM_IA64_UNISTD_H */

arch/ia64/kernel/entry.S

@@ -1776,6 +1776,7 @@ sys_call_table:
 	data8 sys_sched_setattr
 	data8 sys_sched_getattr
 	data8 sys_renameat2
+	data8 sys_getrandom
 
 	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */