Fix google-explicit-constructor warnings.

Bug: 28341362
Change-Id: I625fbab25f16282c2ea929cd16283d9d146fa17b
diff --git a/media/libmedia/IRemoteDisplayClient.cpp b/media/libmedia/IRemoteDisplayClient.cpp
index bedeb6c..ca67665 100644
--- a/media/libmedia/IRemoteDisplayClient.cpp
+++ b/media/libmedia/IRemoteDisplayClient.cpp
@@ -32,7 +32,7 @@
 class BpRemoteDisplayClient: public BpInterface<IRemoteDisplayClient>
 {
 public:
-    BpRemoteDisplayClient(const sp<IBinder>& impl)
+    explicit BpRemoteDisplayClient(const sp<IBinder>& impl)
         : BpInterface<IRemoteDisplayClient>(impl)
     {
     }