disp: msm: obtain bridge from bridge chain

Commit 05193dc38197 ("drm/bridge: Make the bridge chain
a double-linked list") creates a bridge chain linked
list. This change updates the relevant changes to msm
driver to use the list to find the bridge associated to
the encoder.

Change-Id: I59eb2910be96f4fff7bdbeb040d6ad204c41d747
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/dsi/dsi_display.c

@@ -6381,7 +6381,7 @@ int dsi_display_drm_ext_bridge_init(struct dsi_display *display,
 		return -EINVAL;
 
 	drm = encoder->dev;
-	bridge = encoder->bridge;
+	bridge = drm_bridge_chain_get_first_bridge(encoder);
 	sde_conn = to_sde_connector(connector);
 	prev_bridge = bridge;