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_hal_manager.h

@@ -36,7 +36,7 @@ private:
 	libcamera::CameraManager *cameraManager_;
 
 	const camera_module_callbacks_t *callbacks_;
-	std::vector<std::unique_ptr<CameraDevice>> cameras_;
+	std::vector<std::shared_ptr<CameraDevice>> cameras_;
 };
 
 #endif /* __ANDROID_CAMERA_MANAGER_H__ */