sound_control: various changes

* add function to disable/enable soundcontrol
* add workaround to prevent audio reset
* make it depend on defconfig
* remove headset_boost
* remove mic_gain
* small cleanup
msm: mdss: Adding lcd notifier

Supports notifier for start&end of LCD power on&off

Change-Id: Idaa685a2c554286da5f764519305d830c4d1a1bd
Signed-off-by: Se Hun Kim <sean2.kim@lge.com>
Signed-off-by: Jongrak Kwon <jongrak.kwon@lge.com>
Signed-off-by: Devin Kim <dojip.kim@lge.com>
msm: hotplug: Add MSM Hotplug driver
add missing kconfig entry