Added CONFIG_HDMI_SOURCE.

Some tests are specific to HDMI source devices (e.g. OTT boxes) and
should not be run on HDMI sink devices (e.g. TV panels, phones). This
change introduces the CONFIG_HDMI_SOURCE value for the test_required_configs
metadata key.

Bug: 145499731
Test: manual
Change-Id: I5f32db915ac23d45fd57a04364b25a127c11e570
2 files changed