Zero hidl-generated structs (cas)

Bug: 131356202
Test: boot
Change-Id: I41de4b8de19a060e064ff8457b81b918c4ce887f
diff --git a/cas/1.1/default/MediaCasService.cpp b/cas/1.1/default/MediaCasService.cpp
index eb3fa6b..122c53f 100644
--- a/cas/1.1/default/MediaCasService.cpp
+++ b/cas/1.1/default/MediaCasService.cpp
@@ -68,7 +68,7 @@
 Return<void> MediaCasService::enumeratePlugins(enumeratePlugins_cb _hidl_cb) {
     ALOGV("%s", __FUNCTION__);
 
-    vector<HidlCasPluginDescriptor> results;
+    hidl_vec<HidlCasPluginDescriptor> results;
     mCasLoader.enumeratePlugins(&results);
 
     _hidl_cb(results);