change overlay.bin to overlay.bit.bin in firmware (#985)
change overlay.bin to overlay.bit.bin in firmware (#985)


yunqu/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,yunqu/PYNQ,cathalmccabe/PYNQ,yunqu/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,Xilinx/PYNQ,schelleg/PYNQ,schelleg/PYNQ,schelleg/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,cathalmccabe/PYNQ,Xilinx/PYNQ,schelleg/PYNQ,yunqu/PYNQ,Xilinx/PYNQ,yunqu/PYNQ