drm/i915: Implement WaDisableVFclkgate.
This workaround supposedly fixes some hangs in the VF unit. Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171216001117.14232-1-rafael.antognolli@intel.com
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