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>

src/soc/intel/cannonlake/smmrelocate.c

@@ -301,11 +301,12 @@ void smm_relocate(void)
 
 void smm_lock(void)
 {
+	struct device *sa_dev = pcidev_path_on_root(SA_DEVFN_ROOT);
 	/*
 	 * LOCK the SMM memory window and enable normal SMM.
 	 * After running this function, only a full reset can
 	 * make the SMM registers writable again.
 	 */
 	printk(BIOS_DEBUG, "Locking SMM.\n");
-	pci_write_config8(SA_DEV_ROOT, SMRAM, D_LCK | G_SMRAME | C_BASE_SEG);
+	pci_write_config8(sa_dev, SMRAM, D_LCK | G_SMRAME | C_BASE_SEG);
 }