quda

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This is something to do post GK merge. Some possible options include

quda_parallel
quda_offload
QUDA_PARALLEL
QUDA_OFFLOAD

For aesthetic reasons I prefer lower case, but understand the reasoning for all caps to designate a preprocessor definition. Any other suggestions @mathiaswagner, @weinbe2, @hummingtree?

We should use all caps specifically to designate the preprocessor definition. I'd be receptive to something like quda::parallel as well but I don't think we can namespace defines like that?

As for the specific wording, I'm relatively indifferent. As an external example, Kokkos uses KOKKOS_FUNCTION (and KOKKOS_LAMBDA, KOKKOS_INLINE_FUNCTION, etc), but I don't see a specific need to copy them.