DeskClock: Don't rely on framework

* Building within an AOSP environment sets sdk_version: "current"
  which makes the build fail here due to usage of "com.android.internal"
  stuff
* Set local ids instead where required and use PreferenceImageView
  from androidx instead of com.android.internal

Change-Id: I5b50531720840ae81559c8fd958166154098b782