Use C:V:D in mac address (43:56:44) rather than A:V:D (41:56:44)

Change-Id: Ie6378c17c4a4932f04f24f4d84b4a858a92e364b
(cherry picked from commit e13a2184c535faacf11657c38fc0a226f6da0466)
diff --git a/host/libs/config/guest_config.cpp b/host/libs/config/guest_config.cpp
index d4783b6..83b5935 100644
--- a/host/libs/config/guest_config.cpp
+++ b/host/libs/config/guest_config.cpp
@@ -212,7 +212,7 @@
 
   auto mac = xmlNewChild(nic, nullptr, xc("mac"), nullptr);
   xmlNewProp(mac, xc("address"),
-             xc(concat("00:41:56:44:", std::setfill('0'), std::hex,
+             xc(concat("00:43:56:44:", std::setfill('0'), std::hex,
                        std::setw(2), guest_id, ':', std::setw(2), nic_id)
                     .c_str()));