[IA64] Wire up getrandom() system call

See commit c6e9d6f38894798696f23c8084ca7edbf16ee895
    random: introduce getrandom(2) system call

for all the details (and even a manual page!)

Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index ba3d03503..4c13837 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -1776,6 +1776,7 @@
 	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 */