PCI: brcmstb: Split post-link up initialization to brcm_pcie_start_link()

Previously brcm_pcie_setup() initialized the Root Port itself as well as
doing the actual link-up.  Split brcm_pcie_setup() into two functions:

  - brcm_pcie_setup(), which initializes everything that does not require
    the link itself to be up, and

  - brcm_pcie_start_link(), which brings up the link and initializes things
    that depend on the link being up.

[bhelgaas: condense commit log, deferring details for future changes]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jim Quinlan <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Tested-by: Florian Fainelli <[email protected]>

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