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/soc/intel/broadwell/igd.c

@@ -512,7 +512,7 @@ static void igd_init(struct device *dev)
 
 	/* Wait for any configured pre-graphics delay */
 	if (!acpi_is_wakeup_s3()) {
-#if IS_ENABLED(CONFIG_CHROMEOS)
+#if CONFIG(CHROMEOS)
 		if (display_init_required() || vboot_wants_oprom())
 			mdelay(CONFIG_PRE_GRAPHICS_DELAY);
 #else