device: Add support for multiple PCI segment groups

Add initial support for multiple PCI segment groups. Instead of
modifying secondary in the bus struct introduce a new segment_group
struct element and keep existing common code.

Since all platforms currently only use 1 segment this is not a
functional change. On platforms that support more than 1 segment the
segment has to be set when creating the PCI domain.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ied3313c41896362dd989ee2ab1b1bcdced840aa8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79927
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/lib/smbios.c

@@ -1114,7 +1114,7 @@ static int smbios_generate_type41_from_devtree(struct device *dev, int *handle,
 	return smbios_write_type41(current, handle,
 					name, // name
 					instance_id, // inst
-					0, // segment group
+					dev->bus->segment_group, // segment group
 					dev->bus->secondary, //bus
 					PCI_SLOT(dev->path.pci.devfn), // device
 					PCI_FUNC(dev->path.pci.devfn), // func
@@ -1167,7 +1167,7 @@ static int smbios_generate_type9_from_devtree(struct device *dev, int *handle,
 				  0,
 				  1,
 				  0,
-				  0,
+				  dev->bus->segment_group,
 				  dev->bus->secondary,
 				  dev->path.pci.devfn);
 }