ub: add hash table basic function in ubcore

driver inclusion
category: feature
bugzilla: NA
CVE: NA

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

Add hash table basic function in ubcore, which will be used to store info
in ubcore device.

Use hlist_head and hlist_node as the implementation of hash table.

Provided ops:
- hashtable alloc/free
- add/remove/lookup node

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