ASoC: fsl: Add SGTL5000 based audio machine driver.

This is the SGTL5000 codec based audio driver supported with both
playback and capture dai link implemention.

This implementation is only compatible with device tree definition.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Alison Wang <b18965@freescale.com>

---
This patch has almost been reviewed okay in the mail list. However
the maintainer Mark Brown suggested to use simple-card framework
instead of individual machine driver.
The discussion could be found:
URL: http://lkml.iu.edu//hypermail/linux/kernel/1312.2/02078.html

Since from Linux Kernel V3.12 to V3.14, it changes to much for ALSA
ASoC framework for supporting simple-card, and there will be about
more than 100 patches to backport it, and will also be many potiential
risks, so here just using individual machine driver instead of simple-card on SDK branch.

Change-Id: Ia37f752f8ee6362e726c3a9c602977aa7c0991b2
Reviewed-on: http://git.am.freescale.net:8181/19755
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Jingchang Lu <jingchang.lu@freescale.com>
Reviewed-by: Huan Wang <alison.wang@freescale.com>
Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>

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