enable system suspend

revert !279 (merged) and add the workaround script for temporary kernel bugs we haven't yet fixed.

from my preliminary tests (with looking at system consumption on shipmode or looking at charge_now after a while), I'd say suspend can save roughly 40% of power consumption compared to a completely idle display-off, no modem, but wifi connected device. I see ~0,13 A during suspend.

dependencies:

• https://source.puri.sm/Librem5/linux-next/-/issues/156 (boardmobi firmware issue)
• https://source.puri.sm/Librem5/linux-next/-/merge_requests?label_name%5B%5D=suspend