Fix google-explicit-constructor warnings in camera.

* Add explicit keyword to conversion constructors.
Bug: 28341362
Test: build with WITH_TIDY=1

Change-Id: I61f9b5b2b6e13e0c6561327bc8dfe69c9cfc5ba5
diff --git a/services/camera/libcameraservice/device3/Camera3OutputStream.h b/services/camera/libcameraservice/device3/Camera3OutputStream.h
index 7f7d6d2..46c1465 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputStream.h
@@ -46,7 +46,7 @@
     uint32_t combinedUsage;
     size_t totalBufferCount;
     bool isConfigured;
-    StreamInfo(int id = CAMERA3_STREAM_ID_INVALID,
+    explicit StreamInfo(int id = CAMERA3_STREAM_ID_INVALID,
             int setId = CAMERA3_STREAM_SET_ID_INVALID,
             uint32_t w = 0,
             uint32_t h = 0,