main/postmarketos-mkinitfs: Add option to place DTB in Android boot image second area
Mainline U-Boot looks for the device tree blob in the "second" area of the Android boot image (see https://patchwork.ozlabs.org/patch/1025211/).
Add an option
deviceinfo_bootimg_dtb_second to place the device DTB there. (The option sounds pretty bad, I'm open for alternative suggestions...)
I'm working on a mainline U-Boot port for NovaThor U8500 devices. It needs this option to boot mainline.
Related pmbootstrap MR: pmbootstrap!1828 (merged)