core: BatteryManager: Add few more Battery broadcast intents

 * maximum_capacity
 * design_capacity

Change-Id: Idfa9207cc8bd35469876f3094f3bc948741c94bf
Signed-off-by: Jyotiraditya Panda <jyotiraditya@aospa.co>
Signed-off-by: Adithya R <gh0strider.2k18.reborn@gmail.com>