Merge changes If824cb70,I025d9d68,Ic5a57a89,If5d63f39,I1adb1906 into main

* changes:
  init: Add the ability to find the boot device by partition UUID
  init: Move the stripping of "/devices" and "/devices/platform/" to a helper
  init: Break FindPlatformDevice() into a helper function
  init: Factor GetBlockDeviceInfo() out of GetBlockDeviceSymlinks()
  init: Use ConsumePrefix() instead of open coding in GetBlockDeviceSymlinks()