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平台：TQ3399
内核：Linux4.4
驱动的添加：
1.添加驱动
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2.修改 sound/soc/codec/Kconfig以及Makefile加入驱动编译
sound/soc/codec/Kconfig：
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sound/soc/codec/Makefile
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3.menuconfig中 enable simple card 以及 codec
makemenuconfig
Device Drivers --->
Sound card support ---> Advanced Linux Sound Architecture ---> ALSA for SoC audio support --->
ASoC support for Rockchip Rockchip I2S Device Driver
CODEC drivers --->
Realtek ALC5640 CODEC
ASoC Simple sound card support
4.在dts中添加节点
rk3399-excavator-sapphire.dtsi
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