drm/bridge: dw-hdmi: Staticize dw_hdmi_bridge_funcs

Staticize dw_hdmi_bridge_funcs to fix the following sparse warning:

drivers/gpu/drm/bridge/dw_hdmi.c:1458:25: warning: symbol 'dw_hdmi_bridge_funcs' was not declared. Should it be static?
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/bridge/dw_hdmi.c

@@ -1457,7 +1457,7 @@ static struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs = {
 	.best_encoder = dw_hdmi_connector_best_encoder,
 };
 
-struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
+static struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
 	.enable = dw_hdmi_bridge_enable,
 	.disable = dw_hdmi_bridge_disable,
 	.pre_enable = dw_hdmi_bridge_nop,