s390/chsc: use notifier for AP configuration changes

The direct dependency of chsc and the AP bus prevents the
modularization of ap bus. Introduce a notifier interface for AP
changes, which decouples the producer of the change events (chsc) from
the consumer (ap_bus).

Remove the ap_cfg_chg() interface and replace it with the notifier
invocation. The ap bus module registers a notification handler, which
triggers the AP bus scan.

Cc: Vineeth Vijayan <[email protected]>
Cc: Peter Oberparleiter <[email protected]>
Signed-off-by: Holger Dengler <[email protected]>
Reviewed-by: Harald Freudenberger <[email protected]>
Acked-by: Vineeth Vijayan <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

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