Revert "PCI: Coalesce host bridge contiguous apertures"

This reverts commit 65db0405.

Guenter reported that after 65db0405, the ppc:sam460ex qemu emulation
no longer boots from nvme:

  nvme nvme0: Device not ready; aborting initialisation, CSTS=0x0
  nvme nvme0: Removing after probe failure status: -19

Link: https://lore.kernel.org/r/20210709231529.GA3270116@roeck-us.net


Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>