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/intel/cannonlake_rvp/dsdt.asl

@@ -39,7 +39,7 @@ DefinitionBlock(
 		}
 	}
 
-	#if IS_ENABLED(CONFIG_CHROMEOS)
+	#if CONFIG(CHROMEOS)
 	// Chrome OS specific
 	#include <vendorcode/google/chromeos/acpi/chromeos.asl>
 	#endif