conman: Stop noisy logging of wpa_supplicant state.

This log message was useful, but ultimately too noisy, regularly
causing logos throttling to occur.  It might be worth revisiting a
less noisy way of logging this later, but for now, apply the quick fix
to prevent other important log messages from getting dropped.

Change-Id: Id11046d8aaf8fdb554b320551f46b82d1fc897ae
1 file changed