PCI: Call platform_set_drvdata earlier in devm_pci_alloc_host_bridge

PCI: Call platform_set_drvdata earlier in devm_pci_alloc_host_bridge

Many drivers can now use pci_host_common_probe() directly.
Their hardware window setup can be moved from their 'custom' probe
functions to individual driver init functions.

Link: https://lore.kernel.org/r/20210125162934.5335-2-daire.mcnamara@microchip.com
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>