[PATCH v3 1/2] video/hdmi: Introduce helpers for the HDMI audio infoframe payload

The DP is using the same audio infoframe payload as hdmi, per DP 1.3 spec, but it has a different header. Provide a new interface here, it just packs the payload. Signed-off-by: Chris Zhong --- Changes in v3: - add size < HDMI_AUDIO_INFOFRAME_SIZE check according to Doug's

[PATCH v3 1/2] video/hdmi: Introduce helpers for the HDMI audio infoframe payload

The DP is using the same audio infoframe payload as hdmi, per DP 1.3 spec, but it has a different header. Provide a new interface here, it just packs the payload. Signed-off-by: Chris Zhong --- Changes in v3: - add size < HDMI_AUDIO_INFOFRAME_SIZE check according to Doug's advice Changes in