Add xiaomi-miatoll and upgrade SM7125 kernel to v6.9.2

Upgrade the SM7125 kernel to v6.9.2 and add support the Xiaomi Redmi Note 9 Pro (Global) and Xiaomi Redmi Note 9S.

In order to achieve this upgrade, samsung-a52q and samsung-a72q packages had to be dropped. The a52q maintainer (Leandro Friedrich) has bricked their phone and the a72q maintainer (map220v) doesn't have time to support this device. I have received approval from both maintainers for this change.

I have also decided to keep all the Miatoll variants in one device package, as these devices are so similar and mostly only have a different board-id and slightly different camera sensors. Let me know if it's better split each device into separate device packages.