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/device/pcix_device.c b/src/device/pcix_device.c
index e40ed3b..7ddc15d 100644
--- a/src/device/pcix_device.c
+++ b/src/device/pcix_device.c
@@ -107,11 +107,11 @@
 	sstatus = pci_read_config16(dev, pos + PCI_X_SEC_STATUS);
 
 	if (PCI_X_SSTATUS_MFREQ(sstatus) != PCI_X_SSTATUS_CONVENTIONAL_PCI)
-		pcix_tune_bus(dev->link_list);
+		pcix_tune_bus(dev->downstream);
 
 	/* Print the PCI-X bus speed. */
-	printk(BIOS_DEBUG, "PCI: %02x:%02x: %s\n", dev->link_list->segment_group,
-	       dev->link_list->secondary, pcix_speed(sstatus));
+	printk(BIOS_DEBUG, "PCI: %02x:%02x: %s\n", dev->downstream->segment_group,
+	       dev->downstream->secondary, pcix_speed(sstatus));
 }
 
 /** Default device operations for PCI-X bridges */