RTL8822CS SDIO WiFi/BT support

[chewitt]

Support for the RTL8822CS SDIO chip has been merged so we can add WiFi/BT support to the following:

• Amediatec X96-Air (SM1) boards
• BananaPi WiFi mezzanine for BPI-M5
• LibreComputer WiFi mezzanine for LePotato?

IIRC @xdarklight has the gbit variant, and @warpme has the 10/100 variant of the X96-air boxes for testing.

[chewitt]

The BPI-M5 / M2S mezzanine WiFi works well with the driver merged for Linux 6.2, but unable to get BT working.

[chewitt]

BT works with the right rtl822cs_config.bin file (not the ones upstream). Issue raised on the mailing-list:

https://marc.info/?l=linux-bluetooth&m=167696357121709&w=2

[chewitt]

This series resolves 1500000 baud UART speed on G12A/B and SM1 boards allowing the BT module to work with current upstream config which sets speed and flow-control details:

https://patchwork.kernel.org/project/linux-amlogic/list/?series=724172