Reduce logspam in nudriver

Currently, there is a lot of logspam in nudriver. Reduce the spam.

Test: flash the device and let it idle. Open 'adb logcat'. Observe.
Before the change: logspam @ about 10 messages / second
After the change: no logspam
Bug: 65494379

Change-Id: Ie952fdcab61aa89bb72d9c6dc63487643febd974