clocksource: acpi_pm: Add external callback for suspend/resume

Provides the capability to register an external callback for the ACPI PM
timer, which is called during the suspend and resume processes.

Signed-off-by: Marek Maslanka <mmaslanka@google.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240812184150.1079924-1-mmaslanka@google.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>