libwvdrmengine: Fix double ownership of WVDrmFactory

Using std::make_shared with ndk::SharedRefBase objects causes memory
errors.

Bug: 226379467
Test: TH
Change-Id: I3649ace96067e68cfc0ac998c836d9a8bd48bd11

libwvdrmengine/aidl_src/WVCreatePluginFactories.cpp

@@ -12,7 +12,7 @@ namespace drm {
 namespace widevine {
 
 std::shared_ptr<WVDrmFactory> createDrmFactory() {
-  return std::make_shared<WVDrmFactory>();
+  return ndk::SharedRefBase::make<WVDrmFactory>();
 }
 
 }  // namespace widevine