ppc4xx: Canyonlands: Print SATA/PCIe configuration and board revision

Canyonlands (460EX) shares the first PCIe interface with the SoC SATA
interface. This usage can be configured with the jumper J6. This patch
displays the current configuration upon bootup and changes the PCIe
init loop, to only initialize the availabel PCIe slots.

Signed-off-by: Stefan Roese <sr@denx.de>