LoongArch: pci root bridige set acpi companion only when not acpi_disabled.

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP

--------------------------------

Fix patch "LoongArch: Add PCI controller support"
Signed-off-by: NTianli Xiong <xiongtianli@loongson.cn>
Change-Id: If6084f05cc42ac33b44a7b6aeabdd1366a0bccdd

arch/loongarch/pci/acpi.c

@@ -26,12 +26,14 @@ void pcibios_add_bus(struct pci_bus *bus)
 
 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 {
-	struct pci_config_window *cfg = bridge->bus->sysdata;
-	struct acpi_device *adev = to_acpi_device(cfg->parent);
-	struct device *bus_dev = &bridge->bus->dev;
+	if (!acpi_disabled) {
+		struct pci_config_window *cfg = bridge->bus->sysdata;
+		struct acpi_device *adev = to_acpi_device(cfg->parent);
+		struct device *bus_dev = &bridge->bus->dev;
 
-	ACPI_COMPANION_SET(&bridge->dev, adev);
-	set_dev_node(bus_dev, pa_to_nid(cfg->res.start));
+		ACPI_COMPANION_SET(&bridge->dev, adev);
+		set_dev_node(bus_dev, pa_to_nid(cfg->res.start));
+	}
 
 	return 0;
 }