Hide volume slider in Output Switcher when volume adjustment is restricted

-Check UserManager.DISALLOW_ADJUST_VOLUME
-Hide slider when unsupported

Bug: 153922342
Test: 1.Open CTS-V app > Device Owner Tests
2.install CtsEmptyDeviceOwner.apk -"adb install -r -t CtsEmptyDeviceOwner.apk"
3.enter the command "adb shell dpm set-device-owner com.android.cts.emptydeviceowner/.EmptyDeviceAdmin"
4.push Check device owner button
5.open Policy transparency test and go to Disallow adjust volume > Enable the switch > Open settings.

Change-Id: Iac2793ead6d93d4eaada19c4eec33885d4b97138