util: Add the missing wakecpu m5op in X86.

Change-Id: I74876a4638ad37308ecdb0ef68513a968fac8787
Reviewed-on: https://gem5-review.googlesource.com/6501
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Gabe Black <gabeblack@google.com>
diff --git a/util/m5/m5op_x86.S b/util/m5/m5op_x86.S
index 6d16293..9578741 100644
--- a/util/m5/m5op_x86.S
+++ b/util/m5/m5op_x86.S
@@ -67,6 +67,7 @@
 TWO_BYTE_OP(m5_quiesce_cycle, M5OP_QUIESCE_CYCLE)
 TWO_BYTE_OP(m5_quiesce_time, M5OP_QUIESCE_TIME)
 TWO_BYTE_OP(m5_rpns, M5OP_RPNS)
+TWO_BYTE_OP(m5_wake_cpu, M5OP_WAKE_CPU)
 TWO_BYTE_OP(m5_exit, M5OP_EXIT)
 TWO_BYTE_OP(m5_fail, M5OP_FAIL)
 TWO_BYTE_OP(m5_init_param, M5OP_INIT_PARAM)