Remove duplicated code in MPC8572DS 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: Chenhui Zhao <b26998@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>