MLK-23642-2: ASoC: hdmi-codec: Add iec958 kcontrol

Add iec958 controls, then user can set the AES from user space.
The command is "iecset", which is in alsa-utils.

For HBR test, we need do below steps
1. Generate iec61937 mat stream by ffmpeg.
   ffmpeg -i input.mlp -acodec copy -f spdif output.spd

2. Add iec60958 header by iec958 plugin in alsa-lib

<confdir:pcm/iec958.conf>

IMX-CDNHDMI.pcm.iec958.0 {
	@args [ CARD AES0 AES1 AES2 AES3 ]
	@args.CARD {
		type string
	}
	@args.AES0 {
		type integer
	}
	@args.AES1 {
		type integer
	}
	@args.AES2 {
		type integer
	}
	@args.AES3 {
		type integer
	}
	type iec958
	slave {
		format IEC958_SUBFRAME_LE
		pcm {
			type file
			slave.pcm null
			file "output.spd.iec958"
			format "raw"
		}
	}
	status [ $AES0 $AES1 $AES2 $AES3 ]
	preamble.z 0x1
	preamble.x 0x0
	preamble.y 0x0
}
aplay -Diec958:3,AES0=0x06,AES1=0x80,AES2=0x02,AES3=0x09 -r 192000 -c 2 -f S16_LE output.spd

3. Enable non-linear pcm.
   iecset -c 3 audio off

4. aplay -Dcdnhdmi8ch -r 192000 -c 8 -f S32_LE output.spd.iec958
pcm.cdnhdmi8ch {
        type dshare
        slave {
                pcm "hw:3,0"
                channels 8
                rate 192000
                format S32_LE
        }
        ipc_key 5144458
        bindings.0 0
        bindings.1 4
        bindings.2 1
        bindings.3 5
        bindings.4 2
        bindings.5 6
        bindings.6 3
        bindings.7 7
}

5. Test is finished, disable non-linear pcm
   iecset -c 3 audio on

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Viorel Suman <viorel.suman@nxp.com>

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