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/soc/intel/denverton_ns/lpc.c b/src/soc/intel/denverton_ns/lpc.c
index 7ebca1e..ae923d7 100644
--- a/src/soc/intel/denverton_ns/lpc.c
+++ b/src/soc/intel/denverton_ns/lpc.c
@@ -275,7 +275,7 @@
 
 	/* Swizzle this device if needed */
 	config = targ_dev->chip_info;
-	parent_bdf = targ_dev->path.pci.devfn | targ_dev->bus->secondary << 8;
+	parent_bdf = targ_dev->path.pci.devfn | targ_dev->upstream->secondary << 8;
 	if (is_dnv_swizzled_rp(parent_bdf) && irq_dev != targ_dev) {
 		swiz_int_pin = dnv_get_swizzled_pin(config, parent_bdf, new_int_pin);
 		printk(BIOS_DEBUG, "%s: dnv swizzle %s from %c to %c\n", __func__,
@@ -387,7 +387,7 @@
 
 		int_line = dnv_get_int_line(irq_dev);
 		printk(BIOS_DEBUG, "%s: %02x:%02x.%d pin %d int line %d\n", __func__,
-		       irq_dev->bus->secondary, devfn >> 3, devfn & 0x7, int_pin, int_line);
+		       irq_dev->upstream->secondary, devfn >> 3, devfn & 0x7, int_pin, int_line);
 
 		pci_write_config8(irq_dev, PCI_INTERRUPT_LINE, int_line);
 	}