Expand KUnit coverage for event_property_update() beyond the null connector skip. Add cases for the disconnected, missing-state and missing-device skip branches, plus the fully connected path where hdcp_get_content_protection_from_status() maps HDCP_OFF to DESIRED and HDCP1 TYPE0 encryption to ENABLED. The connected-path tests use dm_kunit_alloc_adev() so the drm_device has an initialised mode_config connection_mutex, and pre-set the connector state to the expected content protection value so drm_hdcp_update_content_protection() takes its no-change early return. Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com> Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>