drm/atomic-helper: Disable appropriate planes in disable_planes_on_crtc()

Currently, the helper drm_atomic_helper_disable_planes_on_crtc() calls
->atomic_disable for all planes _to be_ enabled on a particular CRTC.
This is obviously wrong for those planes which are not scanning out frames
when the helper is called.  Instead, it's sane to disable active planes
of old_crtc_state in the helper.

Suggested-by: Daniel Vetter <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Russell King <[email protected]>
Cc: Peter Senna Tschudin <[email protected]>
Cc: Lucas Stach <[email protected]>
Signed-off-by: Liu Ying <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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