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/mainboard/roda/rk9/ti_pci7xx1.c b/src/mainboard/roda/rk9/ti_pci7xx1.c
index 3ff339c..970e83d 100644
--- a/src/mainboard/roda/rk9/ti_pci7xx1.c
+++ b/src/mainboard/roda/rk9/ti_pci7xx1.c
@@ -19,7 +19,7 @@
 		u16 gcr = pci_read_config16(dev, 0x86);
 		for (fn = 5; fn > 0; --fn) {
 			const struct device *const d =
-				pcidev_path_behind(dev->bus, PCI_DEVFN(slot, fn));
+				pcidev_path_behind(dev->upstream, PCI_DEVFN(slot, fn));
 			if (!d || d->enabled) continue;
 			printk(BIOS_DEBUG,
 				"%s: Hiding function #%d.\n", __func__, fn);