powerpc/pseries/pci: Associate PEs to VFs in configure SR-IOV

After initial validation of SR-IOV resources, firmware will associate
PEs to the dynamic VFs created within this call. This patch adds the
association of PEs to the PF array of PE numbers indexed by VF.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Juan J. Alvarez <jjalvare@linux.vnet.ibm.com>
Acked-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>