Adding temp whitelist methods to PowerWhitelistManager interface.

Migrating temp whitelist APIs to PowerWhitelistManager to allow
telephony to add apps to the temp whitelist.

Bug: 138239060
Bug: 140141678
Bug: 141155196
Bug: 142420609
Bug: 144864180
Test: atest PowerWhitelistTest
Change-Id: Iefd6ecf89aad46de042ef3a1ec0c20d6c35da5a6