PCI: dw-rockchip: Use pci_epc_init_notify() directly

PCI: dw-rockchip: Use pci_epc_init_notify() directly

A previous commit ("PCI: dwc: ep: Remove dw_pcie_ep_init_notify() wrapper")
removed the dw_pcie_ep_init_notify() wrapper and changed the DWC glue
drivers to instead use pci_epc_init_notify() directly.

The endpoint support for the dw-rockchip had not been merged at that point
in time, so the previous commit wrapper") did not update dw-rockchip.

Do the same change for dw-rockchip, so that the driver will not try
to use a function that has now been removed.

Link: https://lore.kernel.org/linux-pci/20240622132024.2927799-2-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>