ice: Add driver specific prefix to LAG defines

A define in the LAG code is missing a driver specific prefix.
Add a prefix to the define.

Also shorten a defines name and move to a more logical place.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>