[Intel-gfx] Problems with HDMI audio on Intel DG45FC motherboard

[Wu Fengguang]

Hi,

My tests show that

- the checksum field cannot be removed - otherwise 8-channel audio
  will be played only as 2-channel.
- if add a 800ms sleep in intel_hdmi_playback_pcm_prepare(), the
  first-0.5s-samples-lost problem disappears

Attached is the updated patchset.

Thanks,
Fengguang

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