Improve handling of CEC versions in CTS tests

A device may only support CEC 1.4. Thus even if CTS tests attempt to set
the CEC version to 2.0 the device will continue to report 1.4.
Tests that require CEC 2.0 will be skipped on 1.4-only devices.

Test: atest CtsHdmiCecHostsideTests
Bug: 169121290
Change-Id: Ib001ff7e4aa61ceed3c1f206c62cbb7890bb5fe1
7 files changed