[ecdsa] Try increasing sampling rate with updated firmware

[vogelpi]

Currently, we're sampling with 50 MHz and the target is running at ~5 MHz for ECDSA captures to keep a 10x oversampling ratio (some of this work is not yet in the repo). Above 50 MHz it seems the synchronization between multiple runs/segments is lost. We should re-investigate this with an updated Husky firmware.