Adding fuzzer for DrmManagerService

Fuzzing DrmManagerService using fuzzService API

Test: m drmserver_fuzzer && adb sync && adb shell /data/fuzz/x86_64/drmserver_fuzzer/drmserver_fuzzer
Bug: 232439428
Change-Id: I939fd452ca798619c2993e99e1b7318ee79326f4
diff --git a/drm/drmserver/DrmManagerService.h b/drm/drmserver/DrmManagerService.h
index f9b8bef..56201d9 100644
--- a/drm/drmserver/DrmManagerService.h
+++ b/drm/drmserver/DrmManagerService.h
@@ -141,6 +141,8 @@
 
     virtual status_t dump(int fd, const Vector<String16>& args);
 
+    friend class DrmManagerServiceFuzzer;
+
 private:
     sp<DrmManager> mDrmManager;
 };