drm/i915: Restore debugfs/i915_gem_gtt back to its former glory

drm/i915: Restore debugfs/i915_gem_gtt back to its former glory

The passed in flag that distinguishes i915_gem_pin_display from
i915_gem_gtt is from node->info_ent->data not the data function
parameter.

Fixes: 6da8482936c7 ("drm/i915: Focus debugfs/i915_gem_pinned to show...")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160819115625.17688-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>