WIP: main/postmarketos-mkinitfs: allow multiple dtbs
This makes mkinitfs support adding multiple dtb files to /boot, and adds both the 1.1 and 1.2 dtb into pinephone images.
Now the pinephone needs to patches for u-boot that set $fdtfile correctly in the u-boot environment so it can be used to select the right dtb file.
Edited by Administrator