x86, acpi, idle: Restructure the mwait idle routines

People seem to delight in writing wrong and broken mwait idle routines;
collapse the lot.

This leaves mwait_play_dead() the sole remaining user of __mwait() and
new __mwait() users are probably doing it wrong.

Also remove __sti_mwait() as its unused.

Cc: Arjan van de Ven <[email protected]>
Cc: Jacob Jun Pan <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Rui Zhang <[email protected]>
Acked-by: Rafael Wysocki <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>

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