microblaze: Add syscall number comment

Trivial fix.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/syscall_table.S

@@ -380,6 +380,6 @@ ENTRY(sys_call_table)
 	.long sys_process_vm_readv
 	.long sys_process_vm_writev
 	.long sys_kcmp
-	.long sys_finit_module
+	.long sys_finit_module		/* 380 */
 	.long sys_sched_setattr
 	.long sys_sched_getattr