Do not worry about the name being changed, the GPU performance remains identical. Its just the Device ID has been updated in the drivers.
The reason the R5 shows in games is that the display on your laptop is connected to the R5, so the games cannot recognise the other GPU. The R7 GPU should be used automatically with games, providing your have the laptop connected to the AC Power.
Learn how to configure your switchable graphics laptop in the document below.