message: ENH: use AXOM_CUDA_ARCH when generating hostconfig
  Modify the uberenv-axom package to use AXOM_CUDA_ARCH as the CMake
  cache variable in the host-configs.
diff: @@ -419,11 +419,11 @@ class UberenvAxom(Package):
  cfg.write(cmake_cache_entry("CMAKE_CUDA_COMPILER", "${CUDA_TOOLKIT_ROOT_DIR}/bin/nvcc"))
  if on_blueos_p9:
  - cfg.write(cmake_cache_entry("CUDA_ARCH", "sm_70"))
  + cfg.write(cmake_cache_entry("AXOM_CUDA_ARCH", "sm_70"))
  else:
  - cfg.write(cmake_cache_entry("CUDA_ARCH", "sm_60"))
  + cfg.write(cmake_cache_entry("AXOM_CUDA_ARCH", "sm_60"))
  - cfg.write(cmake_cache_entry("CMAKE_CUDA_FLAGS" ,"-restrict -arch ${CUDA_ARCH} -std=c++11 --expt-extended-lambda -G"))
  + cfg.write(cmake_cache_entry("CMAKE_CUDA_FLAGS" ,"-restrict -arch ${AXOM_CUDA_ARCH} -std=c++11 --expt-extended-lambda -G"))
  if "+mpi" in spec:
  cfg.write(cmake_cache_entry("CMAKE_CUDA_HOST_COMPILER", "${MPI_CXX_COMPILER}"))
  