ub: ubcore add jetty-related api definition which will be used by driver

driver inclusion
category: feature
bugzilla: NA
CVE: NA

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Ubcore add jetty-related api definition which will be used by driver.

API which will be used by driver:
- ubcore_dispatch_async_event()

API definitions added in ubcore_ops are the methods which will be
implemented by drivers.

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