IMU detection failure on nRF54L15

[ge90114b]

The same IMU sensor module(ICM45686) and code work perfectly on an nRF52840, but it just won't detect on the nRF54L15. I already tried adding the INT0 pin to the overlay file and wired it on the IMU module, but that didn't fix it.

[ge90114b]

At the same time, after testing, the 512 size main stack in prj.conf cannot make nrf54l15 run properly. I tried to change it to 1024, and after flashing, it can start normally.

[sctanf]

https://github.com/SlimeVR/SlimeVR-Tracker-nRF/tree/nrf54

wip branch; it appears using spi00 will work, but there are limitations on spi bus speed