drm/i915: Fix a couple of "should it be static?" sparse warnings
A genuine 'static' omission and 2 other warnings triggered by not including the header where those functions where defined. Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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