In HypreBoomerAMG, use theta = 0.25 for cuda hypre builds.
In HypreBoomerAMG, use theta = 0.25 for cuda hypre builds.

In HypreAMS and HypreADS, set the amg_* options based on the
type of the hypre build, cpu or cuda.

A few updates in the construction of HypreAMS and HypreADS to
support hypre built with cuda..

mfem/mfem,mfem/mfem,mfem/mfem,mfem/mfem,mfem/mfem