Fix mediadrmserver not finding IServiceManager instance

bug: 36113291
Change-Id: I8d459e0edd61555a874cce68e178afd8d468e2e4
diff --git a/drm/libmediadrm/DrmHal.cpp b/drm/libmediadrm/DrmHal.cpp
index 595b895..16035c0 100644
--- a/drm/libmediadrm/DrmHal.cpp
+++ b/drm/libmediadrm/DrmHal.cpp
@@ -200,7 +200,7 @@
 Vector<sp<IDrmFactory>> DrmHal::makeDrmFactories() {
     Vector<sp<IDrmFactory>> factories;
 
-    auto manager = ::IServiceManager::getService("manager");
+    auto manager = ::IServiceManager::getService();
 
     if (manager != NULL) {
         manager->listByInterface(IDrmFactory::descriptor,