drm/imx: legacy-bridge: add MODULE_DESCRIPTION

Every module should have a description, without this we get a
build time warning.

Fixes: cc3e8a216d6b ("drm/imx: add internal bridge handling display-timings DT node")
Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Robert Foss <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c

···
 EXPORT_SYMBOL_GPL(devm_imx_drm_legacy_bridge);
 
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Freescale i.MX DRM bridge driver for legacy DT bindings");