Rename privilege_info_db_row and related function

Rename privilege_info_db_row and related function

- Originally privilege_info_db_row_s was made to have all privilege info
such as privilege name, level, issued and deprecaed version or so. But
the required privilege info for privilege verification was reduced to
only privilege level and now, the name is not matched to its role. Hence
rename it properly.

- struct
  - AS-IS: privilege_info_db_row_s
  - TO-BE: privilege_level_info_s
- functions
  - AS-IS: privilege_db_manager_get_privilege_list()
  - TO-BE: privilege_db_manager_get_privilege_level_info_list()

  - AS-IS: free_privilege_info_db_row_list()
  - TO-BE: free_privilege_level_info_list()

Change-Id: Ie72fe0fe423742bc1e7b5f12ff243dd56af23a47
Signed-off-by: Yunjin Lee <yunjin-.lee@samsung.com>