Vitis vision core fails on PYNQ V2.5.1

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@rock @cathalmccabe

I solved this by following what you guys have done. Using custom axis type and custom MAT to stream functions instead of
xf::cv::AXIvideo2xfMat(_src, src_mat);
xf::cv::xfMat2AXIvideo(src_mat, _dst);

The issue is indeed the PYNQ DMA code is not compatible with the sidebands and tuser signal.
It gets stuck on the receive side.

struct axis_t {
ap_uint<8> data;
ap_int<1> last;
};

/*
Unpack a AXI video stream into a xf::cv::Mat<> object
*input: AXI_video_strm
*output: img
*/
template <int TYPE, int ROWS, int COLS, int NPPC>
int AXIstream2xfMat(hls::stream<axis_t> & AXI_video_strm, xf::cv::Mat<TYPE, ROWS, COLS, NPPC>& img) {
axis_t pixelpacket;
int res = 0;

int rows = img.rows;
int cols = img.cols;
int idx = 0;

assert(img.rows <= ROWS);
assert(img.cols <= COLS);

loop_row_axi2mat:   for (int i = 0; i < rows; i++) {
	loop_col_axi2mat: 	for (int j = 0; j < cols; j++) {
			// clang-format off
    		#pragma HLS loop_flatten off
    		#pragma HLS pipeline II=1
			// clang-format on
			AXI_video_strm >> pixelpacket;
	        img.write(idx++, pixelpacket.data);
	}
   }
return res;

}

You can test this using a simple passthrough functions like axiconv on Vitis vision.

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