drm/vmwgfx: Kill a bunch of sparse warnings

We're giving up all attempts to keep cpu- and device byte ordering separate.

This silences sparse when compiled using
make C=2 CF="-D__CHECK_ENDIAN__"

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
index 8b5bc17..2af3fa1 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
@@ -450,8 +450,8 @@
  * Update the implicit fb to the current fb of this crtc.
  * Must be called with the mode_config mutex held.
  */
-void vmw_sou_update_implicit_fb(struct vmw_private *dev_priv,
-				struct drm_crtc *crtc)
+static void vmw_sou_update_implicit_fb(struct vmw_private *dev_priv,
+				       struct drm_crtc *crtc)
 {
 	struct vmw_screen_object_unit *sou = vmw_crtc_to_sou(crtc);