Fix more unused parameter warnings in frameworks/av/drm.

Bug: 27151704
Change-Id: Id153f12623b5d9d447f3f0605c30caf8743c367c
diff --git a/drm/drmserver/main_drmserver.cpp b/drm/drmserver/main_drmserver.cpp
index 434d561..1ce42e8 100644
--- a/drm/drmserver/main_drmserver.cpp
+++ b/drm/drmserver/main_drmserver.cpp
@@ -26,7 +26,7 @@
 
 using namespace android;
 
-int main(int argc, char** argv)
+int main()
 {
     sp<ProcessState> proc(ProcessState::self());
     sp<IServiceManager> sm = defaultServiceManager();