spresense: minor i2c and spi fixes #4386
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For the
busio.SPI()class only one pin (MISOorMOSI) needs to be defined now. There is no need to pass both of them.I2C_TRANSFERreturns a negative value when an error occurs.busio.I2Cclass expects error values to be positive. Adding a minus changes the error values from negative to positive.