Libem phone and Tails

[fsflover]

@irvinewade

I believe that is theoretically fixable either by extending the boot support or by doing a chained boot.

@amosbatto

u-boot starts from eMMC or USB (uuu) while holding down Volume Up.
(Can chain boot from microSD with jumpdrive after USB boot.)

Tails on Librem 5 would really be amazing. Perfect for traveling to untrusted places.