IBatteryPropertiesRegistrar: remove unused functions

* Remove BatteryProperties
* Remove IBatteryPropertiesListener
* Remove IBatteryPropertiesRegistrar.(un)registerListener
  functions

Test: builds
Test: boots
Bug: 68724651
Change-Id: Ic9a9d337e5cb39784db1a2745297ef985dd31653
Merged-In: Ic9a9d337e5cb39784db1a2745297ef985dd31653
(cherry picked from commit dd0e9425)