Fix clang-tidy warnings in mediaresourcemanager.

* Add explicit keyword to conversion constructors.
Bug: 28341362
* Use const reference type for read-only parameters.
Bug: 30407689
Test: build with WITH_TIDY=1

Change-Id: I9aac64b379ddb77a9abb4b03a6648f38e2a756ab
diff --git a/services/mediaresourcemanager/ResourceManagerService.h b/services/mediaresourcemanager/ResourceManagerService.h
index 8f6fe9a..2a4a6b2 100644
--- a/services/mediaresourcemanager/ResourceManagerService.h
+++ b/services/mediaresourcemanager/ResourceManagerService.h
@@ -52,7 +52,7 @@
     virtual status_t dump(int fd, const Vector<String16>& args);
 
     ResourceManagerService();
-    ResourceManagerService(sp<ProcessInfoInterface> processInfo);
+    explicit ResourceManagerService(sp<ProcessInfoInterface> processInfo);
 
     // IResourceManagerService interface
     virtual void config(const Vector<MediaResourcePolicy> &policies);