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/mainboard/google/slippy/acpi_tables.c

@@ -52,7 +52,7 @@ void acpi_create_gnvs(global_nvs_t *gnvs)
 	gnvs->tpmp = 1;
 
 
-#if IS_ENABLED(CONFIG_CHROMEOS)
+#if CONFIG(CHROMEOS)
 	gnvs->chromeos.vbt2 = google_ec_running_ro() ?
 		ACTIVE_ECFW_RO : ACTIVE_ECFW_RW;
 #endif