ub: provide basic ops uobj_lookup_get and put for uobj.

driver inclusion
category: feature
bugzilla: NA
CVE: NA

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Provide basic operation api of uobj:
- uobj_lookup_get(): lookup and get uobj.
- uobj_lookup_put(): lookup and put uobj.

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