PCI: thunder-pem: Use Cavium assigned hardware ID for ThunderX host controller

"CAV" is the only PNP/ACPI hardware ID vendor prefix assigned to Cavium so
fix this as it should be from day one.

Fixes: 44f22bd ("PCI: Add MCFG quirks for Cavium ThunderX pass2.x host controller")
Tested-by: Robert Richter <[email protected]>
Signed-off-by: Tomasz Nowicki <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Robert Richter <[email protected]>
CC: [email protected]	# v4.10+

Author: nowicki-tomasz

drivers/pci/host/pci-thunder-pem.c

@@ -346,7 +346,7 @@ static int thunder_pem_acpi_init(struct pci_config_window *cfg)
 	if (!res_pem)
 		return -ENOMEM;
 
-	ret = acpi_get_rc_resources(dev, "THRX0002", root->segment, res_pem);
+	ret = acpi_get_rc_resources(dev, "CAVA02B", root->segment, res_pem);
 	if (ret) {
 		dev_err(dev, "can't get rc base address\n");
 		return ret;