Correct SPL use of TARGET_MX6UL_9X9_EVK

This converts 1 usage of this option to the non-SPL form, since there is
no SPL_TARGET_MX6UL_9X9_EVK defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/mx6ul_14x14_evk.h b/include/configs/mx6ul_14x14_evk.h
index 635ae78..98b743b 100644
--- a/include/configs/mx6ul_14x14_evk.h
+++ b/include/configs/mx6ul_14x14_evk.h
@@ -13,7 +13,7 @@
 #include "mx6_common.h"
 #include <asm/mach-imx/gpio.h>
 
-#define is_mx6ul_9x9_evk()	CONFIG_IS_ENABLED(TARGET_MX6UL_9X9_EVK)
+#define is_mx6ul_9x9_evk()	IS_ENABLED(CONFIG_TARGET_MX6UL_9X9_EVK)
 
 #define CFG_MXC_UART_BASE		UART1_BASE