joybus: Fix first bit being skipped when console is being turned on #6
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When the console is being turned on the data line is initially low because the console is powered off. This causes joybus-pio to incorrectly conclude that the first MSB bit is 0. The simple fix for this issue is to wait until the data line becomes high before entering the read loop.
However this doesn't work if the console is reset, since we are already in the loop by then. Thus for a complete fix we need to detect if the data line actually returns to a high value, if it doesn't then we should reset the loop by emptying the ISR and waiting for the data line to become high again.
I also included a trivial commit that includes a missing header in the examples.