soc/intel/broadwell/memmap.c: Use `SA_DEV_ROOT` macro

Tested with BUILD_TIMELESS=1, Purism Librem 13 v1 remains identical.

Change-Id: I013357d31974582f64a35b8228d9edfa16af99fd
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46356
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/soc/intel/broadwell/memmap.c b/src/soc/intel/broadwell/memmap.c
index fb9a834..e4c787a 100644
--- a/src/soc/intel/broadwell/memmap.c
+++ b/src/soc/intel/broadwell/memmap.c
@@ -35,8 +35,8 @@
 
 void smm_region(uintptr_t *start, size_t *size)
 {
-	uintptr_t tseg = pci_read_config32(PCI_DEV(0, 0, 0), TSEG);
-	uintptr_t bgsm = pci_read_config32(PCI_DEV(0, 0, 0), BGSM);
+	uintptr_t tseg = pci_read_config32(SA_DEV_ROOT, TSEG);
+	uintptr_t bgsm = pci_read_config32(SA_DEV_ROOT, BGSM);
 
 	tseg = ALIGN_DOWN(tseg, 1 * MiB);
 	bgsm = ALIGN_DOWN(bgsm, 1 * MiB);