drm/i915/sdvo: Add helpers to get the cmd/status string
Add sdvo_cmd_name() and sdvo_cmd_status() helpers to avoid bothering the callers with the implementation details of the storage for these strings. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190619180312.31817-6-ville.syrjala@linux.intel.comReviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
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