s390/ap: modularize ap bus

There is no hard requirement to have the ap bus statically in the
kernel, so add an option to compile it as module.

Cc: Tony Krowiak <[email protected]>
Cc: Halil Pasic <[email protected]>
Signed-off-by: Holger Dengler <[email protected]>
Reviewed-by: Harald Freudenberger <[email protected]>
Reviewed-by: Anthony Krowiak <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

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