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>
diff --git a/src/drivers/amd/agesa/romstage.c b/src/drivers/amd/agesa/romstage.c
index 9b4c50a..d5b20b7 100644
--- a/src/drivers/amd/agesa/romstage.c
+++ b/src/drivers/amd/agesa/romstage.c
@@ -28,7 +28,7 @@
 #include <northbridge/amd/agesa/agesa_helper.h>
 #include <northbridge/amd/agesa/state_machine.h>
 
-#if !IS_ENABLED(CONFIG_POSTCAR_STAGE)
+#if !CONFIG(POSTCAR_STAGE)
 #error "Only POSTCAR_STAGE is supported."
 #endif
 #if HAS_LEGACY_WRAPPER