solidrun: mx6cuboxi: use CONFIG_IS_ENABLED(SATA) instead of ifdef CONFIG_SATA

Prepare for linking setup_sata only when CONFIG_SATA/CONFIG_SPL_SATA
is defined.

Signed-off-by: Troy Kisky <troykiskyboundary@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/solidrun/mx6cuboxi/mx6cuboxi.c b/board/solidrun/mx6cuboxi/mx6cuboxi.c
index cb14c2f..6fa5cf4 100644
--- a/board/solidrun/mx6cuboxi/mx6cuboxi.c
+++ b/board/solidrun/mx6cuboxi/mx6cuboxi.c
@@ -275,9 +275,8 @@
 {
 	setup_iomux_uart();
 
-#ifdef CONFIG_SATA
-	setup_sata();
-#endif
+	if (CONFIG_IS_ENABLED(SATA))
+		setup_sata();
 	setup_fec();
 
 	return 0;