net: 6lowpan: remove const from scalars

net: 6lowpan: remove const from scalars

The keyword const makes no sense for scalar types inside the lowpan_nhc
structure. Most compilers will ignore it so we remove the keyword from
the scalar types.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Reviewed-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Link: https://lore.kernel.org/r/20220428030534.3220410-2-aahringo@redhat.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>