CMAKE: fix vtkm devices namespaces

Vicente Bolearequested to merge
vbolea/vtk-m:fix-vtkm-devices-namespaces into master

This commit completes the cmake namespace vtkm:: feature and adds:

  • Consistency to export every device (before some of them were not being exported).
  • Correctly mangle the names for the device so that internally they are vtkm_ and externally are vtkm::

These changes are already being tested in VTK (MR: vtk!9762 (merged))

Backport: release

Edited by Vicente Bolea

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