Revert "PCI: ecam: Allow cfg->priv to be pre-populated from the root port device"

This reverts commit 4900454.

Now that nobody relies of cfg->priv containing anything useful before the
.init() callback is used, restore the previous behaviour.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250625111806.4153773-4-maz@kernel.org

Author: Marc Zyngier

drivers/pci/ecam.c

@@ -84,8 +84,6 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
 			goto err_exit_iomap;
 	}
 
-	cfg->priv = dev_get_drvdata(dev);
-
 	if (ops->init) {
 		err = ops->init(cfg);
 		if (err)