i40e/i40evf: Use u64 values instead of casting them in TSO function

i40e/i40evf: Use u64 values instead of casting them in TSO function

BugLink: http://bugs.launchpad.net/bugs/1547674
Instead of casing u32 values to u64 it makes more sense to just start out
with u64 values in the first place.  This way we don't need to create a
mess with all of the casts needed to populate a 64b value.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from net-next commit 03f9d6a59f94f70ae775ca2aae04f2accc01a973)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>