drm/ast: Drop fb_debug_enter/leave

ast doesn't implement the mode_set_base_atomic hook this would need,
so this is dead code.

Signed-off-by: Daniel Vetter <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Sam Bobroff <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: YueHaibing <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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