Revert "dm: pci: Allow scan bridge child devices before relocation"

This reverts commit df189d9ba3f8fd1bc67e3c0c3c4ace16cd065ee1.

Unfortunately this commit breaks chromebook_link because it adds lots of PCI devices
before relocation and there is not enough pre-reloc malloc() memory.

Rathar then increase this memory, revert for now until we figure this out.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>