libwvhidl: implement setPlaybackId

Bug: 159337195
Bug: 168341163
Test: GtsMediaTestCases MediaDrmTest#testSetPlaybackId
Change-Id: I4fc687892c9dd3b8077b3ecdfd9bbc355b298571

libwvdrmengine/mediadrm/include_hidl/WVDrmPlugin.h

@@ -225,6 +225,10 @@ struct WVDrmPlugin : public ::drm::V1_4::IDrmPlugin, IDrmPluginListener,
 
   Return<bool> requiresSecureDecoderDefault(const hidl_string& mime) override;
 
+  Return<::drm::V1_0::Status> setPlaybackId(
+      const hidl_vec<uint8_t>& sessionId,
+      const hidl_string& playbackId) override;
+
   // The following methods do not use hidl interface, it is used internally.
   virtual Status unprovisionDevice();