powerpc/smp: Dynamically build Powerpc topology

powerpc/smp: Dynamically build Powerpc topology

Currently there are four Powerpc specific sched topologies.  These are
all statically defined.  However not all these topologies are used by
all Powerpc systems.

To avoid unnecessary degenerations by the scheduler, masks and flags
are compared. However if the sched topologies are build dynamically then
the code is simpler and there are greater chances of avoiding
degenerations.

Note:
Even X86 builds its sched topologies dynamically and proposed changes
are very similar to the way X86 is building its topologies.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231214180720.310852-6-srikar@linux.vnet.ibm.com