This removes u-boot from our image and allows booting via an
UEFI-compatible platform firmware instead.
So to flash pmOS on the PPP now we will require the user to
flash a platform firmware image once after which they can write
this pmOS image to an sdcard or the internal storage
I recommend using https://github.com/Tow-Boot/Tow-Boot as the platform
firmware of choice. Once flashed to internal storage, hold the volume up
button while booting to boot into UMS mode. Plug your phone into a PC
and flash to the storage that appears.
You can also flash to an sdcard instead and hold volume down while
booting to boot from it rather than the internal storage
