drm/i915: remove unused function declaration
This function is not part of the driver anymore. Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Fixes: 90f4fcd5 ("drm/i915: Remove forced stop ring on suspend/unload") Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20170804140348.24971-1-lionel.g.landwerlin@intel.com
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