drm/nouveau/nvif: import library functions for the ioctl/event interfaces
This is a wrapper around the interfaces defined in an earlier commit,
and is also used by various userspace (either by a libdrm backend, or
libpciaccess) tools/tests.
In the future this will be extended to handle channels, replacing some
long-unloved code we currently use, and allow fifo/display/mpeg (hi
Ilia ;)) engines to all be exposed in the same way.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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