[POWERPC] Update PCI nodes in the 83xx/85xx boards device tree

Updated the 83xx & 85xx device tree PCI related compartible property.

Used the following compatible properties:
	PCI     "fsl,mpc8349-pci"
	PCI     "fsl,mpc8540-pci"
	PCI-X:  "fsl,mpc8540-pcix"
	PCIe:   "fsl,mpc8548-pcie"

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>