i40e: remove useless debug noise

This message really doesn't give any useful information and ends up
getting printed every service_task loop in the Linux driver, filling the
logfile with noise when AQ tracing is enabled.  This patch simply removes
the noise.

Change-ID: I30ad51e6b03c7ad12a7d9c102def0087db622df3
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>