powerpc/86xx: Rework MPC8641HPCN pci_init_board to use common FSL PCIe code

Remove duplicated code in MPC8641HPCN board and utilize the common
fsl_pcie_init_board().  We also now dynamically setup the LAWs for PCI
controllers based on which PCIe controllers are enabled.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>