device/device.h: Rename busses for clarity

This renames bus to upstream and link_list to downstream.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I80a81b6b8606e450ff180add9439481ec28c2420
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78330
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/southbridge/amd/pi/hudson/lpc.c b/src/southbridge/amd/pi/hudson/lpc.c
index 266d75c..66ec824 100644
--- a/src/southbridge/amd/pi/hudson/lpc.c
+++ b/src/southbridge/amd/pi/hudson/lpc.c
@@ -171,8 +171,8 @@
 	reg_var[0] = pci_read_config16(dev, 0x64);
 
 	struct device *child;
-	if (dev->link_list) {
-		for (child = dev->link_list->children; child; child = child->sibling) {
+	if (dev->downstream) {
+		for (child = dev->downstream->children; child; child = child->sibling) {
 			if (child->enabled && (child->path.type == DEVICE_PATH_PNP)) {
 				struct resource *res;
 				for (res = child->resource_list; res; res = res->next) {
diff --git a/src/southbridge/intel/bd82x6x/pcie.c b/src/southbridge/intel/bd82x6x/pcie.c
index 13f16f8..a1dd16e 100644
--- a/src/southbridge/intel/bd82x6x/pcie.c
+++ b/src/southbridge/intel/bd82x6x/pcie.c
@@ -145,8 +145,8 @@
 	 * must be a static device from devicetree.cb.
 	 * If one is found assume it's an integrated device and not a PCIe slot.
 	 */
-	if (dev->link_list)
-		child = pcidev_path_behind(dev->link_list, PCI_DEVFN(0, 0));
+	if (dev->downstream)
+		child = pcidev_path_behind(dev->downstream, PCI_DEVFN(0, 0));
 
 	/* Set slot power limit as configured above */
 	reg32 = pci_read_config32(dev, cap + PCI_EXP_SLTCAP);