VTS: Check for "ro.board.first_api_level" in GetBarringInfo()

Some GRF targets launched with S release do not support getBarringInfo()
API.

Check "ro.board.first_api_level" also to return from the test-case
when the response is REQUEST_NOT_SUPPORTED.

Bug: 226017947
Bug: 212384410
Merged-In: I890f54f80ff3aca3dcb2c51f20db087d453c2927
Change-Id: I890f54f80ff3aca3dcb2c51f20db087d453c2927
(cherry picked from commit becb08fa)
(cherry picked from commit abf00a93)