cpu idle cooling driver breaks S3 suspend

Feature: https://source.puri.sm/Librem5/use-cases/issues/75

initial tests and reports on the devkit: https://source.puri.sm/Librem5/linux-next/issues/64

our out-of-tree cooling driver (CONFIG_CPU_IDLE_THERMAL=y) that uses cpu-idle (autor: Daniel Lezcano) breaks S3 suspend. for the bugreport, see: https://lore.kernel.org/linux-pm/34b1ed94-1223-60ec-ac4f-0b32be67eab2@linaro.org/