message: Use RAJA's CUDA_ARCH logic
diff: @@ -55,9 +55,9 @@ class Raja(CMakePackage):
  if '+cuda' in spec:
  if on_blueos_p9:
  - options.extend(['-DCMAKE_CUDA_FLAGS:STRING=-arch sm_70'])
  + options.extend(['-DCUDA_ARCH=sm_70'])
  elif on_blueos:
  - options.extend(['-DCMAKE_CUDA_FLAGS:STRING=-arch sm_60'])
  + options.extend(['-DCUDA_ARCH=sm_60'])
  options.extend([
  '-DENABLE_CUDA=On',
  