AP_HAL_Linux: fix SPIUARTDriver to work with GPS autodetection #26997
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GPS auto-detection requires get_baud_rate to return non-zero. The SPIUARTDriver was returning 0.
Tested on NavIO2.
Still something strange going on:
... but it's now working.
Note that the return value doesn't actually matter here, it's just got to be non-zero.