[qemu] 调整lvgl配置参数

bsp/qemu-vexpress-a9/drivers/lvgl/lv_conf.h

@@ -11,11 +11,12 @@
 #ifndef LV_CONF_H
 #define LV_CONF_H
 
-#define LV_USE_PERF_MONITOR     1
-#define LV_COLOR_DEPTH          16
+#define LV_USE_PERF_MONITOR         1
+#define LV_COLOR_DEPTH              16
 
 /* music player demo */
 #include <rtconfig.h>
+#define LV_DISP_DEF_REFR_PERIOD     10
 #define LV_HOR_RES_MAX          BSP_LCD_WIDTH
 #define LV_VER_RES_MAX          BSP_LCD_HEIGHT
 #define LV_USE_DEMO_RTT_MUSIC       1