[i.MX6][AUDIO AC97] Add driver v1.0 for SECO AC97 codecs

This driver coming from SECO driver library:
 - driver: seco_ac97_imx6
- version: v1.0

Support for:
- VT1613
- ALC655

dmsg:
...
[    3.831676] ALSA device list:
[    3.842157]   #0: seco-ac97_standard
...

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: secoac97standar [seco-ac97_standard], device 0: ALC655-analog alc655-hifi-analog-0 [ALC655-analog alc655-hifi-analog-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ISSUE: bit clock only @ 44100Hz