drm: Move master functions into drm_auth.c

For modern drivers pretty much the only thing drm_master does is
handling authentication for the primary/legacy drm_minor node. Instead
of having it all over drm files, move it all together into drm_auth.c.

This patch just does code-motion, follow up patches will also extract
the master logic from file open&release paths.

Reviewed-by: Chris Wilson Mchris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465930269-7883-5-git-send-email-daniel.vetter@ffwll.ch

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