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/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index 34ebcb2..79e9ee5 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -26,7 +26,7 @@
 	/* Can we find out how much memory we can use at most
 	 * this way?
 	 */
-	pci_tolm = find_pci_tolm(dev->link_list);
+	pci_tolm = find_pci_tolm(dev->downstream);
 	printk(BIOS_DEBUG, "pci_tolm: 0x%x\n", pci_tolm);
 
 	tolud = pci_read_config8(d0f0, TOLUD) << 24;
@@ -65,7 +65,7 @@
 	for (res = dev->resource_list; res; res = res->next)
 		report_resource_stored(dev, res, "");
 
-	assign_resources(dev->link_list);
+	assign_resources(dev->downstream);
 }
 
 static const char *northbridge_acpi_name(const struct device *dev)