drm/i915: Move flags describing VMA mappings into the VMA

If these flags are on the object level it will be more difficult to allow
for multiple VMAs per object.

v2: Simplification and cleanup after code review comments (Chris Wilson).

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -116,7 +116,7 @@ static const char *get_tiling_flag(struct drm_i915_gem_object *obj)
 
 static inline const char *get_global_flag(struct drm_i915_gem_object *obj)
 {
-	return obj->has_global_gtt_mapping ? "g" : " ";
+	return i915_gem_obj_to_ggtt(obj) ? "g" : " ";
 }
 
 static void