Install proprietary userspace modules under /vendor.

BUG: 5284436

Change-Id: I9921b8446626b7041a3fc66bff918d3adac5bbe1

proprietary/streamcontrol/test/TestPlayer.cpp

@@ -191,7 +191,7 @@ static void PrintMessage(const char *msg)
 
 static void OpenDrmPlugin()
 {
-    const char *path = "/system/lib/drm/libdrmwvmplugin.so";
+    const char *path = "/vendor/lib/drm/libdrmwvmplugin.so";
     sSharedLibHandle = dlopen(path, RTLD_NOW);
     if (sSharedLibHandle == NULL) {
         fprintf(stderr, "Can't open plugin: %s\n", path);