wv hidl: setRequestingSid to true

HALs need to getCallingSid to verify clients.

[ Merge of http://go/wvgerrit/89123 ]

Bug: 134787536
Test: log calling sid
Change-Id: I9cfbddfc274457a6802d9c8f37470d656771acc6

libwvdrmengine/src_hidl/WVDrmFactory.cpp

@@ -63,7 +63,7 @@ Return<void> WVDrmFactory::createPlugin(
     const hidl_string& appPackageName,
     createPlugin_cb _hidl_cb) {
 
-  WVDrmPlugin *plugin = NULL;
+  sp<IDrmPlugin> plugin;
   if (!isCryptoSchemeSupported(uuid.data())) {
     ALOGE("Widevine Drm HAL: failed to create drm plugin, " \
         "invalid crypto scheme");
@@ -80,6 +80,7 @@ Return<void> WVDrmFactory::createPlugin(
 
   plugin = new WVDrmPlugin(getCDM(), appPackageName.c_str(),
                            &sOemCryptoInterface, areSpoidsEnabled());
+  android::hardware::setRequestingSid(plugin, true);
   _hidl_cb(Status::OK, plugin);
   return Void();
 }