Update code for camera/recorder device state APIs

Update code for camera/recorder device state APIs

1. Remove device state change signal emit related code.(signal will be emitted on upper layer)
2. Add signal emit function
3. Remove unused code

[Version] 0.10.78
[Profile] Common
[Issue Type] Update
[Dependency module] N/A
[Dependency commit] N/A
[Test] [M(T) - Boot=(OK), sdb=(OK), Home=(OK), Touch=(OK), Version=tizen-mobile_20161007.1]

Change-Id: Ifacc5e69ae9354304e311ef654292eb80ba1a921
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>