cpu/SMT: Move SMT prototypes into cpu_smt.h

In order to export the cpuhp_smt_control enum as part of the interface
between generic and architecture code, the architecture code needs to
include asm/topology.h.

But that leads to circular header dependencies. So split the enum and
related declarations into a separate header.

[ ldufour: Reworded the commit's description ]

Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Laurent Dufour <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Zhang Rui <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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