PCI: cadence: Set cdns_pcie_host_init() global

During the resume sequence of the host, cdns_pcie_host_init() needs to be
called, so set it global.

The dev function parameter is removed, as it isn't used.

Link: https://lore.kernel.org/linux-pci/20240102-j7200-pcie-s2r-v7-2-a2f9156da6c3@bootlin.com


Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>