PM: sleep: Remove unused pm_generic_ wrappers

pm_generic_thaw_early() has been unused since 2016's
commit 294f47ff ("PM / Domains: Remove redundant system PM callbacks")

pm_generic_freeze_late() has been unused since 2019's
commit 3cd7957e ("ACPI: PM: Simplify and fix PM domain hibernation
callbacks")

Remove them.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250307021750.457600-1-linux@treblig.org


Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>