drm/i915: Remove the double handling of 'flags from intel_mode_from_pipe_config()

We're trying to copy the flags from the adjusted mode to the
passed in mode twice. Once is enough.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222140442.7204-2-ville.syrjala@linux.intel.com


Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>