drm: Merge __drm_atomic_helper_disable_all() into drm_atomic_helper_disable_all()

The only difference between the functions is the clean_old_fbs argument, whose
use was removed in the patch referenced below. So remove the internal
copy and drop the guts back into drm_atomic_helper_disable_all()

Changes in v2:
- Instead of just removing the unused arg, merge the functions

Fixes: e00fb8564ee9 ("drm: Stop updating plane->crtc/fb/old_fb on atomic drivers")
Cc: Ville Syrjälä <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Sinclair Yeh <[email protected]> # This email bounces :(
Cc: Maxime Ripard <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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