SBC-AM57x hardware reference design drawings

本代码是AM5728平台上实现GPIO电灯的驱动代码，适用于初学者，里面有文档描述(This code is the AM5728 platform for the realization of the GPIO lamp driver code, suitable for beginners, there is a document descr iption in it)

AM5728 平台sdk包，修改了电源管理等一些BUG。(AM5728 Platform SDK package, modify the power management and some other BUG.)