soc/intel: Rename some SMM support functions

Rename southbridge_smm_X to smm_southbridge_X.
Rename most southcluster_smm_X to smm_southbridge_X.

Change-Id: I4f6f9207ba32cf51d75b9ca9230e38310a33a311
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34856
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/baytrail/pcie.c b/src/soc/intel/baytrail/pcie.c
index b2b2d3c..6dc0346 100644
--- a/src/soc/intel/baytrail/pcie.c
+++ b/src/soc/intel/baytrail/pcie.c
@@ -215,7 +215,7 @@
 		strpfusecfg = pci_read_config32(dev, STRPFUSECFG);
 
 		if (config->pcie_wake_enable)
-			southcluster_smm_save_param(
+			smm_southcluster_save_param(
 				SMM_SAVE_PARAM_PCIE_WAKE_ENABLE, 1);
 	}