overlay: Add config for usb-moded
https://gitlab.com/ubports/porting/community-ports/android11/fairphone-4/fairphone-fp4/-/merge_requests/14 was supposed to be targeted at 20.04, so here's take two...
Add information about USB vendor & product IDs. Information is taken from /vendor/etc/init/hw/init.qcom.usb.rc
(after umounting the bind-mount on top).
Disable usb-moded
's rescue mode since this port is now bootable on Focal (which fixes MTP & ADB upon boot without having to replug).
Also includes a miscellaneous change done on main
updating the README.md