ppc4xx: Canyonlands: Remove unnecessary FDT warning upon DTB fixup

Depending on the configuration jumper "SATA SELECT", U-Boot disabled
either one PCIe node or the SATA node in the device tree blob. This
patch removes the unnecessary and even confusing warning, when the node
is not found at all.

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