使能 LVGL 库和 LVGL demo

在 根目录下执行 me，进入 menuconfig 的功能配置界面，配置如下：

Application options  --->
    *** Filesystem related ***
    [*] Using File System Image 0  --->
        --- Using File System Image 0
        Select File System Type (FATFS)  --->
        (rodat/) Data Directory
        (app.fatfs) Image Name
        [*] auto calcuate image size
    [*] Using File System Image 1  ----
    [ ] Generate burner format image
    *** lvgl demo select related ***
    -*- LVGL (official): powerful and easy-to-use embedded GUI library  --->
        (20)  Priority of LVGL thread
        (32768) Stack size of LVGL thread
        (5)   Display refresh period (ms)
        [ ]   Support SquareLine Studio
        [ ]   Enable built-in examples
        [ ]   Enable built-in demos
    -*- ArtInChip lvgl demo
        select lvgl demo (lvgl demo with basic function)  --->
            (X) lvgl demo with basic function
            ( ) lvgl demo of meter
        (16)  LVGL color depth(32/16)
        (2)   LVGL image cached number  
        (0x800000) LVGL image cached size  
        (20)  LVGL image header cached number         
        [*]   LVGL enable display rotation  
                 LVGL rotation degree (90)  ---> 
        (8)   LVGL image cached number
    (/rodata/lvgl_data) LVGL Resource Directory

资源文件配置时，编译环境会根据 /packages/artinchip/lvgl-ui/aic_demo/<select demo>/SConscrpt 脚本中 ins_src 的路径将对应路径的资源文件打包到 rodata 分区中。