(SHIFT) deviceinfo: add build id preference

This adds the build id to settings to let users verify
the base AOSP tag we are based on.

The entry can be found at:
  - Settings -> About -> Android version -> Build id

Change-Id: I29eb961c6b63d5381859aeb34cdc658d75dbe201
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
4 files changed