Expose a `backend` parameter in AutoML for turning on/off GPU support in XGBoost

Description

This param is available in XGBoost. Exposing it would be very helpful for benchmarking and/or debugging. In AutoML, we might want to rename the options, since selecting GPU doesnt mean that all algorithms will be gpu, so it might make sense to call the options something else. Let's think about it...

In the http://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/xgboost.html?highlight=backend: backend: Specify the backend type. This can be done of the following: “auto”, “gpu”, or “cpu”. By default (auto), a GPU is used if available.

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Erin LeDell

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