Remove no longer necessary Trilinos-specific code to allow building against Trilinos installation of Kokkos

Arndt, Danielrequested to merge
github/fork/aprokop/trilinos_kokkos into master

Created by: aprokop

If desired, merging can be delayed until the required patch lands in Trilinos develop. Tested against kokkos/kokkos#2817 snapshotted into Trilinos (hash 669a373f4ff).

Fix #224 (closed)

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