Kernel support for power management

Proper kernel support should exist for controlling the hardware's power on the Librem 5.

Deliverable: https://source.puri.sm/Librem5/deliverables-for-the-librem5-release/issues/2

changed the description

assigned to @angus.ainslie

Added a patch 40919db5 for modem wakeup.

mentioned in issue #16 (closed)

mentioned in issue #17

mentioned in issue #18 (closed)

mentioned in issue #19

mentioned in issue #20

mentioned in issue #21

mentioned in issue #22 (closed)

removed milestone

mentioned in commit cc1b9961

mentioned in commit ff74b012

mentioned in commit 010139bf

mentioned in commit ca946505

mentioned in issue #496 (closed)

mentioned in commit 3d08c52b

mentioned in commit 56b27447