Passpoint setting for GL.iNet Flint 3 and Slate 7

To enable Passpoint on GL.iNet Flint 3 and Slate 7, using the factory default firmware which is based on Qualcomm SDK, do the following: Upgrade the firmware to the latest version (4.8.4 for GL-BE9300 Flint 3, 4.8.3 for GL-BE3600 Slate 7, as of this writing). Setup each Wi-Fi interface with "wpa3-m…