[SANTINO][DTS] Change sound driver

Changed audio driver for SGTL5000 codec. The `simple-audio-card` didn't
create the sound card. The speaker enable needs to be driven by the OS.

Test procedure:
```
root@seco-imx6dl-santino:~# amixer sset Lineout unmute
root@seco-imx6dl-santino:~# amixer sset Lineout 31
root@seco-imx6dl-santino:~# amixer sset PCM 192
root@seco-imx6dl-santino:~# gpioset gpiochip4 29=1
root@seco-imx6dl-santino:~# aplay -Dhw:0,0 /usr/share/sounds/alsa/Front_Right.wav
```

JIRA Reference: [SANTINO-23]