CEC VTS: Improve testGetPortInfo test

Add validation to the response from testGetPortInfo HAL API.

Bug: 157402557
Test: vts-tradefed run commandAndExit vts-hal-tv -m VtsHalTvCecV1_0Host
Change-Id: I4193d516c66991758a781b2a6b6ff8a2cc4ae0f8
1 file changed