powerpc/powernv/sriov: Refactor M64 BAR setup

Split up the logic so that we have one branch that handles setting up a
segmented window and another that handles setting up single PE windows for
each VF.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200722065715.1432738-14-oohall@gmail.com