Add layer_fini() when shutting down the compositor
Fixed
Description
libweston10 added extended the API to include some layer_fini() calls, which we do not use/call into agl compositor, resulting in some err/warning messages when shutting down the compositor.
libweston10 added extended the API to include some layer_fini() calls, which we do not use/call into agl compositor, resulting in some err/warning messages when shutting down the compositor.