acpi_cpu: use fixed resource ids for cx state i/o resources
acpi_cpu: use fixed resource ids for cx state i/o resources

... instead of the ever increasing ones.
Also, do free old resources when allocating new ones when cx states
change.

Tested by:	Tom Lislegaard <Tom.Lislegaard@proact.no>
Obtained from:	jkim
MFC after:	1 week

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