PCI: Remove unnecessary check of device_type == pci

PCI host drivers have already matched on compatible strings, so checking
device_type is redundant. Also, device_type is considered deprecated for
FDT though we've still been requiring it for PCI hosts as it is useful
for finding PCI buses.

Signed-off-by: Rob Herring <[e-mail]>
[[e-mail]: reformatted the log]
Signed-off-by: Lorenzo Pieralisi <[e-mail]>
Acked-by: Alan Douglas <[e-mail]>
Acked-by: Subrahmaya Lingappa <[e-mail]>
Acked-by: Michal Simek <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Lorenzo Pieralisi <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: Alan Douglas <[e-mail]>
Cc: Subrahmanya Lingappa <[e-mail]>
Cc: Michal Simek <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]

drivers/pci/controller/pci-host-common.c

···
 int pci_host_common_probe(struct platform_device *pdev,
 			  struct pci_ecam_ops *ops)
 {
-	const char *type;
 	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
 	struct pci_host_bridge *bridge;
 	struct pci_config_window *cfg;
 	struct list_head resources;
···
 	bridge = devm_pci_alloc_host_bridge(dev, 0);
 	if (!bridge)
 		return -ENOMEM;
-
-	type = of_get_property(np, "device_type", NULL);
-	if (!type || strcmp(type, "pci")) {
-		dev_err(dev, "invalid \"device_type\" %s\n", type);
-		return -EINVAL;
-	}
 
 	of_pci_check_probe_only();
 

drivers/pci/controller/pcie-cadence-host.c

···
 
 static int cdns_pcie_host_probe(struct platform_device *pdev)
 {
-	const char *type;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct pci_host_bridge *bridge;
···
 
 	rc->device_id = 0xffff;
 	of_property_read_u16(np, "device-id", &rc->device_id);
-
-	type = of_get_property(np, "device_type", NULL);
-	if (!type || strcmp(type, "pci")) {
-		dev_err(dev, "invalid \"device_type\" %s\n", type);
-		return -EINVAL;
-	}
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg");
 	pcie->reg_base = devm_ioremap_resource(dev, res);

drivers/pci/controller/pcie-mobiveil.c

···
 	struct platform_device *pdev = pcie->pdev;
 	struct device_node *node = dev->of_node;
 	struct resource *res;
-	const char *type;
-
-	type = of_get_property(node, "device_type", NULL);
-	if (!type || strcmp(type, "pci")) {
-		dev_err(dev, "invalid \"device_type\" %s\n", type);
-		return -EINVAL;
-	}
 
 	/* map config resource */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

drivers/pci/controller/pcie-xilinx-nwl.c

···
 			     struct platform_device *pdev)
 {
 	struct device *dev = pcie->dev;
-	struct device_node *node = dev->of_node;
 	struct resource *res;
-	const char *type;
-
-	/* Check for device type */
-	type = of_get_property(node, "device_type", NULL);
-	if (!type || strcmp(type, "pci")) {
-		dev_err(dev, "invalid \"device_type\" %s\n", type);
-		return -EINVAL;
-	}
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
 	pcie->breg_base = devm_ioremap_resource(dev, res);

drivers/pci/controller/pcie-xilinx.c

···
 	struct device *dev = port->dev;
 	struct device_node *node = dev->of_node;
 	struct resource regs;
-	const char *type;
 	int err;
-
-	type = of_get_property(node, "device_type", NULL);
-	if (!type || strcmp(type, "pci")) {
-		dev_err(dev, "invalid \"device_type\" %s\n", type);
-		return -EINVAL;
-	}
 
 	err = of_address_to_resource(node, 0, &regs);
 	if (err) {