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/northbridge/intel/nehalem/gma.c b/src/northbridge/intel/nehalem/gma.c
index be17e2f..86fc583 100644
--- a/src/northbridge/intel/nehalem/gma.c
+++ b/src/northbridge/intel/nehalem/gma.c
@@ -603,7 +603,7 @@
 	/* Init graphics power management */
 	gma_pm_init_pre_vbios(dev);
 
-	if (IS_ENABLED(CONFIG_MAINBOARD_USE_LIBGFXINIT)) {
+	if (CONFIG(MAINBOARD_USE_LIBGFXINIT)) {
 		struct northbridge_intel_nehalem_config *conf = dev->chip_info;
 		int lightup_ok;
 		printk(BIOS_SPEW, "Initializing VGA without OPROM.");