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/lib/bootmode.c

@@ -35,7 +35,7 @@ void gfx_set_init_done(int done)
 int display_init_required(void)
 {
 	/* For Chrome OS always honor vboot_handoff_skip_display_init(). */
-	if (IS_ENABLED(CONFIG_CHROMEOS))
+	if (CONFIG(CHROMEOS))
 		return !vboot_handoff_skip_display_init();
 
 	/* By default always initialize display. */