device-xiaomi-beryllium: move device to community

1. linux-postmarketos-qcom-sdm845: update to latest commit

• Fixes touchscreen input not working in Poco F1 (Tianma variant) in osk-sdl
• Contains basic dts support for Xiaomi Mi 8 Pro(Equuleus) done by @DeltaSporos
• Contains basic dts support for LG G7 and LG V35 @jenneron

2. device-xiaomi-beryllium: move device to community

• Add OSK-SDL support
• Add automatic kernel update support and
• Removed the feedbackd theme as its now upstreamed
• Move device to community.

The detail status of the Poco F1 port can be read from the device wiki page: https://wiki.postmarketos.org/wiki/Xiaomi_Poco_F1_(xiaomi-beryllium)#STATUS

Regards Joel