coreboot: Replace all IS_ENABLED(CONFIG_XXX) with CONFIG(XXX)

This patch is a raw application of

 find src/ -type f | xargs sed -i -e 's/IS_ENABLED\s*(CONFIG_/CONFIG(/g'

Change-Id: I6262d6d5c23cabe23c242b4f38d446b74fe16b88
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31774
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/drivers/smmstore/store.c

@@ -58,7 +58,7 @@
 static int lookup_store(struct region_device *rstore)
 {
 	struct cbfsf file;
-	if (IS_ENABLED(CONFIG_SMMSTORE_IN_CBFS)) {
+	if (CONFIG(SMMSTORE_IN_CBFS)) {
 		if (cbfs_locate_file_in_region(&file,
 			       CONFIG_SMMSTORE_REGION,
 			       CONFIG_SMMSTORE_FILENAME, NULL) < 0) {