Add disableImage() to IImageService

This plumbs ImageManager::DisableImage() through binder.

Bug: 241688845
Test: 1. adb disable-verity
  2. adb reboot
  3. adb enable-verity
  4. adb reboot
  5. Check that "remount" scratch partition under '/data/gsi/remount/'
     is deleted
Change-Id: Ia77b5286bf048076b1ec371ae07b84ae2a1cc064
2 files changed