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/drivers/wifi/generic/smbios.c b/src/drivers/wifi/generic/smbios.c
index 82c96a5..e6ccd5d 100644
--- a/src/drivers/wifi/generic/smbios.c
+++ b/src/drivers/wifi/generic/smbios.c
@@ -38,5 +38,5 @@
 
 int smbios_write_wifi_cnvi(struct device *dev, int *handle, unsigned long *current)
 {
-	return smbios_write_wifi_pcie(dev->bus->dev, handle, current);
+	return smbios_write_wifi_pcie(dev->upstream->dev, handle, current);
 }