drm/i915: Inline intel_modeset_gem_init()

intel_modeset_gem_init() now only sets up the legacy overlay, so let's
remove the function and call the setup directly during driver load. This
should help us find a better point in the initialisation sequence for it
later.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110142634.10551-5-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e7e9e06..1b440f2 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -676,7 +676,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
 	if (ret)
 		goto cleanup_uc;
 
-	intel_modeset_gem_init(dev);
+	intel_setup_overlay(dev_priv);
 
 	if (INTEL_INFO(dev_priv)->num_pipes == 0)
 		return 0;