[MIPS] Wire up sync_file_range(2).

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index f7c4e75..9ba7508 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -461,3 +461,4 @@
 	PTR	sys_ppoll
 	PTR	sys_unshare
 	PTR	sys_splice
+	PTR	sys_sync_file_range