Add basic Camera2Client dump, minor fixes to CameraService dump.

Bug: 6243944
Change-Id: I52caaa6146050c38976768e99b0eeea1d13a3f51
diff --git a/services/camera/libcameraservice/Camera2Client.cpp b/services/camera/libcameraservice/Camera2Client.cpp
index e138cd1..d0a84a5 100644
--- a/services/camera/libcameraservice/Camera2Client.cpp
+++ b/services/camera/libcameraservice/Camera2Client.cpp
@@ -103,7 +103,13 @@
 }
 
 status_t Camera2Client::dump(int fd, const Vector<String16>& args) {
-    return BAD_VALUE;
+    String8 result;
+    result.appendFormat("Client2[%d] (%p) PID: %d:\n",
+            mCameraId,
+            getCameraClient()->asBinder().get(),
+            mClientPid);
+    write(fd, result.string(), result.size());
+    return NO_ERROR;
 }
 
 // ICamera interface