linux-imx

MA-12281 extcon: audio: support headset and hdmi hot-plug

After 4.9 kernel, HDMI && Headset hot-plug event is managed by extcon.
The extcon node is at /sys/class/extcon/extconX.
Audio framework uses below code to handle device switch event:
    frameworks/base/services/core/java/com/android/server/WiredAccessoryManager.java

Make sound card as different audio device as below:
wm8960, wm8962, ak4458: headphone
rpmsg:  line-out
mxc_hdmi,sii902x: hdmi

Change-Id: I201391f093c167c3f9885e0147733a68140386cf
Signed-off-by: Jindong <jindong.yue@nxp.com>