This change is to update the related UI in the battery page if the battery is not present. This includes the following updates: 1. Update the summary of battery tile in the Settings homepage 2. Replace the battery level with "Unknown" 3. Replace the summary with help message in the battery page 4. Remove the battery meter icon Bug: 171368508 Test: verify on an issue device Change-Id: I892e0d137143160a0bce0c11ce9265120ebb8fd4