drm/i915: Enable swfence debugobject support for i915.ko

Only once the debugobject symbols are exported can we enable support for
debugging swfences when i915 is built as a module. Requires commit
2617fdca3f68 ("lib/debugobjects: export for use in modules")

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161205142941.21965-5-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/Kconfig.debug

@@ -24,7 +24,7 @@ config DRM_I915_DEBUG
         select X86_MSR # used by igt/pm_rpm
         select DRM_VGEM # used by igt/prime_vgem (dmabuf interop checks)
         select DRM_DEBUG_MM if DRM=y
-        select DRM_I915_SW_FENCE_DEBUG_OBJECTS if DRM_I915=y
+	select DRM_I915_SW_FENCE_DEBUG_OBJECTS
         default n
         help
           Choose this option to turn on extra driver debugging that may affect
@@ -48,7 +48,7 @@ config DRM_I915_DEBUG_GEM
 
 config DRM_I915_SW_FENCE_DEBUG_OBJECTS
         bool "Enable additional driver debugging for fence objects"
-        depends on DRM_I915=y
+        depends on DRM_I915
         select DEBUG_OBJECTS
         default n
         help