ice: Cleanup variable initialization in LAG code

In preparation for implementing SRIOV Active-Active LAG support,
cleanup several unneeded variable initializations in declaration
blocks.

Also move a couple of variable initializations into declaration
block that should be there.

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>