[Intel-gfx] [PATCH] drm/i915: add back static declaration

[Chris Wilson]

Quoting Matthew Auld (2021-01-15 10:13:29)
> warning: symbol '__i915_gem_object_create_stolen' was not declared. Should it be static?
> warning: symbol '_i915_gem_object_stolen_init' was not declared. Should it be static?
> 
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris