tree wide: Convert "if (CONFIG_.*_TPM.*)" to "if (IS_ENABLED(...))"

Change-Id: Ib73abb0ada7dfdfab3487c005719e19f51ef1812
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Reviewed-on: https://review.coreboot.org/13779
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/northbridge/intel/sandybridge/romstage.c b/src/northbridge/intel/sandybridge/romstage.c
index d6135bd..df0c5bb 100644
--- a/src/northbridge/intel/sandybridge/romstage.c
+++ b/src/northbridge/intel/sandybridge/romstage.c
@@ -113,7 +113,7 @@
 
 	northbridge_romstage_finalize(s3resume);
 
-	if (CONFIG_LPC_TPM) {
+	if (IS_ENABLED(CONFIG_LPC_TPM)) {
 		init_tpm(s3resume);
 	}