ub: ubcore add event api and add jetty and event api impls to compile

driver inclusion
category: feature
bugzilla: NA
CVE: NA

--------------------------------

Ubcore add event-related api implements, which will finally call
hw driver's registered method.

- ubcore_rearm_jfc: set jfc to the status of ready to receive events.
- ubcore_register_event_handler: Client register an async_event handler
to ubcore
- ubcore_unregister_event_handler: Client unregister async_event handler
from ubcore
- ubcore_dispatch_async_event: Dispatch an asynchronous event to
all registered handlers

Add jetty and event related api to compile.

Signed-off-by: Guoxin Qian <qianguoxin@huawei.com>
Signed-off-by: Yizhen Fan <fanyizhen@huawei.com>