tegra: Sync with Linux kernel UAPI header

Update the UAPI header to the latest version in the Linux kernel. This
changes the struct drm_tegra_gem_mmap to properly handle offsets on 64-
bit architectures.

See commit bdf765071a8b ("drm/tegra: gem: Return 64-bit offset for
mmap(2)") in the Linux kernel (as of v4.1).

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>