thermal: intel: pch: Fix unexpected shutdown at critical temperature

thermal: intel: pch: Fix unexpected shutdown at critical temperature

BugLink: https://bugs.launchpad.net/bugs/1906168
Like previous patch, the intel_pch_thermal device is not in ACPI
ThermalZone namespace, so a critical trip doesn't mean shutdown.

Override the default .critical callback to prevent surprising thermal
shutdoown.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201221172345.36976-2-kai.heng.feng@canonical.com
(cherry picked from commit 03671968d0bf2db598f7e3aa98f190b76c1bb4ff linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>