[MIPS] Wire up sync_file_range(2).

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 52aea55..942aca2 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -387,3 +387,4 @@
 	PTR	sys_ppoll			/* 6265 */
 	PTR	sys_unshare
 	PTR	sys_splice
+	PTR	sys_sync_file_range