drm/tegra: Changes for v3.19-rc1

The highlights in this pull request are:

  * IOMMU support: The Tegra DRM driver can now deal with discontiguous
    buffers if an IOMMU exists in the system. That means it can allocate
    using drm_gem_get_pages() and will map them into IOVA space via the
    IOMMU API. Similarly, non-contiguous PRIME buffers can be imported
    from a different driver, which allows better integration with gk20a
    (nouveau) and less hacks.

  * Universal planes: This is precursory work for atomic modesetting and
    will allow hardware cursor support to be implemented on pre-Tegra114
    where RGB cursors were not supported.

  * DSI ganged-mode support: The DSI controller can now gang up with a
    second DSI controller to drive high resolution DSI panels.

Besides those bigger changes there is a slew of fixes, cleanups, plugged
memory leaks and so on.
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