soc/intel: Expand SA_DEV_ROOT for ramstage

We do not want to disguise somewhat complex function
calls as simple macros.

Change-Id: I298f7f9a1c6a64cfba454e919eeaedc7bb2d4801
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34411
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/poppy/variants/atlas/mainboard.c b/src/mainboard/google/poppy/variants/atlas/mainboard.c
index d4db98e..9c4b2bc 100644
--- a/src/mainboard/google/poppy/variants/atlas/mainboard.c
+++ b/src/mainboard/google/poppy/variants/atlas/mainboard.c
@@ -25,8 +25,10 @@
 
 static uint32_t get_pl2(void)
 {
+	struct device *igd_dev = pcidev_path_on_root(SA_DEVFN_IGD);
 	uint16_t id;
-	id = pci_read_config16(SA_DEV_IGD, PCI_DEVICE_ID);
+
+	id = pci_read_config16(igd_dev, PCI_DEVICE_ID);
 	/* Assume we only have KLB-Y and AML-Y SKUs */
 	if (id == PCI_DEVICE_ID_INTEL_KBL_GT2_SULXM)
 		return PL2_KBL;