android: camera_device: Make CameraDevice a shared object

CameraDevice needs to be wrapper into the std::shared_ptr instead
of std::unique_ptr to enable refcounting. The refcounting will help
us to support hotplug and hot-unplug CameraHalManager operations
in the subsequent commit.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/android/camera_device.cpp

@@ -233,6 +233,13 @@ CameraDevice::~CameraDevice()
 		delete it.second;
 }
 
+std::shared_ptr<CameraDevice> CameraDevice::create(unsigned int id,
+						   const std::shared_ptr<Camera> &cam)
+{
+	CameraDevice *camera = new CameraDevice(id, cam);
+	return std::shared_ptr<CameraDevice>(camera);
+}
+
 /*
  * Initialize the camera static information.
  * This method is called before the camera device is opened.