PCI: Move resource reallocation code to non-__init

Resource reallocation is currently done only at boot-time, but will
soon be done when host bridge is hot-added.  This patch removes the
__init annotations so the code will still be present after boot.

[bhelgaas: split __init changes out]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>