Install proprietary userspace modules under /vendor.

BUG: 5284436

Change-Id: I9921b8446626b7041a3fc66bff918d3adac5bbe1

proprietary/wvm/test/Testlibwvm.cpp

@@ -50,7 +50,7 @@ void TestLibWVM::Load()
 {
     cout << "TestLibWVM::Load" << endl;
 
-    const char *path = "/system/lib/libwvm.so";
+    const char *path = "/vendor/lib/libwvm.so";
     void *handle = dlopen(path, RTLD_NOW);
     if (handle == NULL) {
         fprintf(stderr, "Can't open plugin: %s: %s\n", path, dlerror());