Fix drm enumeration order, resolves failure to play forward lock ringtones

Change-Id: I58e8a26849409bc3bf98b066c5e07c2a0c91e0c9
related-to-bug: 5735466

Author: jefftinker

drm/drmserver/DrmManager.cpp

@@ -99,11 +99,12 @@ void DrmManager::removeUniqueId(int uniqueId) {
 
 status_t DrmManager::loadPlugIns() {
 
+    String8 pluginDirPath("/system/lib/drm");
+    loadPlugIns(pluginDirPath);
+
     String8 vendorPluginDirPath("/vendor/lib/drm");
     loadPlugIns(vendorPluginDirPath);
 
-    String8 pluginDirPath("/system/lib/drm");
-    loadPlugIns(pluginDirPath);
     return DRM_NO_ERROR;
 
 }