drm/bridge: ps8640: Use atomic variants of drm_bridge_funcs

The atomic variants of enable/disable in drm_bridge_funcs are the
preferred operations - introduce these.

The ps8640 driver used the non-atomic variants of the drm_bridge_chain_pre_enable/
drm_bridge_chain_post_disable - convert these to the atomic variants.

v2:
  - Init state operations in drm_bridge_funcs (Laurent)

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Maxime Ripard <[email protected]>
Cc: Jitao Shi <[email protected]>
Cc: Philip Chen <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Robert Foss <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Dave Stevenson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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