libcamera: Switch from utils::make_unique to std::make_unique

Now that we're using C++-14, drop utils::make_unique for
std::make_unique.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/v4l2_videodevice.cpp

@@ -1054,7 +1054,7 @@ V4L2VideoDevice::createBuffer(const struct v4l2_buffer &buf)
 		planes.push_back(std::move(plane));
 	}
 
-	return utils::make_unique<FrameBuffer>(std::move(planes));
+	return std::make_unique<FrameBuffer>(std::move(planes));
 }
 
 FileDescriptor V4L2VideoDevice::exportDmabufFd(unsigned int index,