Revert "PM / Sleep: Unify diagnostic messages from device suspend/resume"

This reverts commit ab3b2f57fc8a37d83036c08b74b3febd1b8983de.
Revert "PM / Usermodehelper: Fix freezer failures due to racy usermodehelper_is_disabled()"

This reverts commit 17c58c3069f88d6a37fc26012722096596c4f56f.
Revert "PM / Docs: Recommend the use of [un]lock_system_sleep() over mutex_[un]lock(&pm_mutex)"

This reverts commit 8e9f19a2604e0f636d8500956a6d29a9477194c4.
Revert "PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()"

This reverts commit 0a295b1cae62c154077e98afd78ba09cb175725d.
Revert "PM / Sleep: Make [un]lock_system_sleep() generic"

This reverts commit c008915d0046e01e9534b737ac77ef4f3921310e.
Revert "PM: Use the freezer_count() functions in [un]lock_system_sleep() APIs"

This reverts commit 73fbac4ffc5651ad69281500b988555c1d8aa79f.