Pass through ssse3 and any other CPU features.

BUG: 64976352
Change-Id: If1c5ca4aee296fbe5b8b4d569b76bec1908d9faf
(cherry picked from commit 1f45db96cea84ee0a06ce4f3efd46a197fba9b29)
diff --git a/config/guest_config.cpp b/config/guest_config.cpp
index 6b59330..700f459 100644
--- a/config/guest_config.cpp
+++ b/config/guest_config.cpp
@@ -261,7 +261,8 @@
       {"-chardev", concat("socket,path=", ivshmem_socket_path_, ",id=ivsocket"),
        "-device",
        concat("ivshmem-doorbell,chardev=ivsocket,vectors=",
-              ivshmem_vector_count_)});
+              ivshmem_vector_count_),
+       "-cpu", "host"});
 
   auto devices = xmlNewChild(root, nullptr, xc("devices"), nullptr);