i40e: Move error message to debug level

i40e: Move error message to debug level

Orabug: 22342532

There is an error coming back from get_phy_capabilities that does not
seem to have any functional implications. We will continue looking into
why this error message is occurring, but in the meantime, we will move it
to debug to avoid confusion.

Change-ID: I9091754bf62c066ddedeb249923d85606e2d68ed
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 52e9689e4ef070eff1e0f9e6e84a8451b86813b5)
Signed-off-by: Brian Maly <brian.maly@oracle.com>