drm/bridge: adv7511: Add Audio support

This patch adds support to Audio for both adv7511 and adv7533
bridge chips.

This patch was originally from [1] by Lars-Peter Clausen <[email protected]>
and was adapted by Archit Taneja <[email protected]> and
Srinivas Kandagatla <[email protected]>.

Then I heavily reworked it to use the hdmi-codec driver. And also
folded in some audio packet initialization done by Andy Green
<[email protected]>. So credit to them, but blame to me.

[1] https://github.com/analogdevicesinc/linux/blob/xcomm_zynq/drivers/gpu/drm/i2c/adv7511_audio.c

Cc: David Airlie <[email protected]>
Cc: Archit Taneja <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Cc: "Ville Syrjälä" <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Andy Green <[email protected]>
Cc: Dave Long <[email protected]>
Cc: Guodong Xu <[email protected]>
Cc: Zhangfei Gao <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Jose Abreu <[email protected]>
Cc: Kuninori Morimoto <[email protected]>
Cc: [email protected]
Acked-by: Lars-Peter Clausen <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Archit Taneja <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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