ANDROID: netfilter/xt_IDLETIMER: restore unregister_pm_notifier() calls

commit 01222b46 ("Merge tag 'v6.13-rc3' into android-mainline")
accidentally removed unregister_pm_notifier() calls which is causing
stability issues. Restore functionality to fix stability issue.

Bug: 424615187
Bug: 423798099
Fixes: 01222b46 ("Merge tag 'v6.13-rc3' into android-mainline")
Change-Id: I5485cb359f00296fa991b76988bbd3c382ed4ad3
Signed-off-by: Vivekanand Tryambake <quic_vtryamba@quicinc.com>
[quic_satyap@quicinc.com: fix commit message to reflect the change]
Signed-off-by: Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com>
[cmllamas: also reorder calls to cancel_work_sync()]
Signed-off-by: Carlos Llamas <cmllamas@google.com>