According to the Autonomo drawing SPI is used for Serial flash and SD Card and is not available on the pin haeders.
Is it with the SPI1 approach feasible to hook up a RDT (Pt100) SPI module?
Is there a small example of how to use SPI1 with a SODAQ Autonomo?
Similar post from 2016
As mentioned in the previous post, all you need to do is compile for the board
SODAQ Autonomo with SP1 and then change any calls to the instance
SPI to call
The pin mappings are listed above.