drm/vblank: Register drmm cleanup action once per drm_vblank_crtc

Since we'll be allocating resources for kthread_create_worker() in the
next commit (which could fail and require us to clean up the mess),
let's simplify the cleanup process a bit by registering a
drm_vblank_init_release() action for each drm_vblank_crtc so they're
still cleaned up if we fail to initialize one of them.

Changes since v3:
* Use drmm_add_action_or_reset() - Daniel Vetter

Cc: Ville Syrjälä <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Lyude Paul <[email protected]>
Acked-by: Dave Airlie <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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