How to use series resistors when connecting sensors to microcontrollers via SPI
You're not supplying power to the sensor through your SPI lines, so its power consumption is not relevant.
Series resistors in SPI lines are not normal, but could possibly be used for ESD protection if the signals are being routed off the board - in which case the value is not critical.
If you're using really high-speed SPI and your signal lines are very long, then I'd guess its possible that someone might suggest using series termination resistors, but the chances of that are remote, and the resistor values are unlikely to be anywhere near the 470 to 1k ohm range.