PCI: dwc: Invoke post_init in dw_pcie_resume_noirq()

In some SoCs like i.MX95, CLKREQ# is pulled low by the controller driver
before link up. After link up, if the 'supports-clkreq' property is
specified in DT, the driver will release CLKREQ# so that it can go high and
the endpoint can pull it low whenever required i.e., during exit from L1
Substates.

Hence, at the end of dw_pcie_resume_noirq(), invoke the '.post_init()'
callback if exists to perform the above mentioned action.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
[mani: reworded description]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251015030428.2980427-9-hongxing.zhu@nxp.com

Author: Richard Zhu

drivers/pci/controller/dwc/pcie-designware-host.c

@@ -1231,6 +1231,9 @@ int dw_pcie_resume_noirq(struct dw_pcie *pci)
 	if (ret)
 		return ret;
 
+	if (pci->pp.ops->post_init)
+		pci->pp.ops->post_init(&pci->pp);
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq);