soc: intel_adsp: Handle reset better in adsplog.py

When working with the SOF kernel driver, it likes to shut down the DSP
on error.  That means there is a very small window in which to catch
any log output, even with a whiteboxed kernel.  So we should be
polling much faster (10 Hz) for changes when we detect a reset.

Also, don't repeatedly log the device reset detection, it spams the
console badly when we crank up the rate.  Just log it once and then
stay silent until we see output.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>