[N9H20] How to use Non-OS NVTFAT with SPI flash

[9chuckyoung]

Non-OS BSP N9H20 GitHub download link: https://github.com/OpenNuvoton/N9H20_emWin_NonOS

NVTFAT document: \N9H20_emWin_NonOS-master\Documents\N9H20 Non-OS Library Reference Guide.pdf

NVTFAT SPI flash guide: \N9H20_emWin_NonOS-master\Documents\How to mount FAT in SPI flash.pdf