Respeaker 2 MiC hat: Does it support Jetson Nano or is that in the roadmap

Yes, it works on JetPack v4.4 Image.
We driver a sensor with spi interface on /dev/spidev0.0

The error report your system lose /dev/spidev0.1

   self.spi.open(bus, device)  # Open SPI port 0, slave device (CS) 1
FileNotFoundError: [Errno 2] No such file or directory

You need change the code to set argument device to 0.
Then use this device tree overlay.