PCI: dwc: Export dw_pcie_wait_for_link() API

Export the dw_pcie_wait_for_link() function to be able to build drivers
using it as loadable modules.
Signed-off-by: NVidya Sagar <vidyas@nvidia.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>

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

@@ -460,6 +460,7 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci)
 
 	return -ETIMEDOUT;
 }
+EXPORT_SYMBOL_GPL(dw_pcie_wait_for_link);
 
 int dw_pcie_link_up(struct dw_pcie *pci)
 {