Draft: Implement /usr/share/deviceinfo and drop /etc/boot/cmdline.txt
/etc/boot/cmdline.txt was simply created as a way to append to the commandline by users on the lack of a solution to properly modify deviceinfo variables. Therefore, implementing /usr/share/deviceinfo[1] makes unnecessary to have the additional cmdline.txt file. To simplify overriding deviceinfo_kernel_cmdline variable, allow an "_append" variable to be used.
[1] https://gitlab.com/postmarketOS/pmaports/-/issues/1836#note_1267128361
Relates https://gitlab.com/postmarketOS/pmaports/-/issues/1836
@jenneron @InsanePrawn, since you were involved in introducing it and should we warned.
Marked as Draft since we have to update at least also:
- Wiki
- pmaports
- mkinitfs