Technical debt -- and one SPI bus fix #165
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overrides the weak definitions to ensure output over RTT.
Also fix `spi_nand_init()` so it doesn't try to release locks that it doesn't own....
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SPI arbitration was broken. Turns out that releasing a mutex that hasn't been acquired is NOT the right thing to do, and then hiding the problem in a helper function just makes it that much harder to track down the real problem.
This branch also allows the buspirate's terminal to be controlled from RTT.
However, the terminal output is not yet sent over RTT ... so you'll still need to connect a terminal for now.