PCI: keystone: Don't discard .probe() callback

The __init annotation makes the ks_pcie_probe() function disappear after
booting completes. However a device can also be bound later. In that case,
we try to call ks_pcie_probe(), but the backing memory is likely already
overwritten.

The right thing to do is do always have the probe callback available.  Note
that the (wrong) __refdata annotation prevented this issue to be noticed by
modpost.

Fixes: 0c4ffcf ("PCI: keystone: Add TI Keystone PCIe driver")
Link: https://lore.kernel.org/r/20231001170254.2506508-5-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org

Author: Uwe Kleine-König

drivers/pci/controller/dwc/pci-keystone.c

@@ -1100,7 +1100,7 @@ static const struct of_device_id ks_pcie_of_match[] = {
 	{ },
 };
 
-static int __init ks_pcie_probe(struct platform_device *pdev)
+static int ks_pcie_probe(struct platform_device *pdev)
 {
 	const struct dw_pcie_host_ops *host_ops;
 	const struct dw_pcie_ep_ops *ep_ops;
@@ -1318,7 +1318,7 @@ static int ks_pcie_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct platform_driver ks_pcie_driver __refdata = {
+static struct platform_driver ks_pcie_driver = {
 	.probe  = ks_pcie_probe,
 	.remove = ks_pcie_remove,
 	.driver = {