Teuchos: Fix #2271
Created by: mhoemmen
Fix #2271 (closed) by doing the following:
- Remove KOKKOS_ENABLE_PROFILING redundant #cmakedefine from Teuchos_config.h
- Do not include Kokkos_Core.h in Teuchos_Time.cpp; use forward declarations for Kokkos::Profiling::{push, pop}Region instead, to improve build time
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