Fix clang-tidy warnings in pme and sim_utils

Fix clang-tidy warnings in pme and sim_utils

1. The global non-const variable was temporary introduced to able to
   test the PME SYCL spread kernel independently of the rest of the PME
   (f190fa59b4a72390b2aea2e74b4960941098ce4d). NOLINT should be
   temporary fix as this variable will go away once the rest of PME
   is implemented in SYCL.
2. The conditionals in sim_utils wrap the same copy operation after
   4d38a0d65839f951bf275e465f8fb65a35b60b8d. So these conditional can
   now be combined.