Adds handling for arduino_default for specifying SPI device, and not CS #560
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This is the so-simple-its-dumb approach to the SPI touchscreen issue. The idea is that we'd add SPI1 and SPI2 to portduino as extern defines, so they're always available. We can tie them to a real hardware device in our init code, and here we just use the spi_host int to specify which one to use. This is an alternative solution to #559
Edit: the addition of is_SPI is because now that we don't necessarily need a CS, there's no other way to determine for sure that it's an SPI device.