drm/bridge: export ptn3460_init function

This patch exports ptn3460_init function so that other modules
can call this function.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

drivers/gpu/drm/bridge/ptn3460.c

@@ -347,3 +347,4 @@ err:
 		gpio_free(ptn_bridge->gpio_rst_n);
 	return ret;
 }
+EXPORT_SYMBOL(ptn3460_init);