Prevent disabling default phone/sms apps in battery setting

- In handleDisableable(), call getKeepEnabledPackages() in the same way
  as AppActionButtonPreferenceController.
- Update getKeepEnabledPackages() to dynamically query default phone/sms
  app packages.

Change-Id: I8dc7d6248cf440dcc053f6acba9d5548d5670c41
Merged-In: I8dc7d6248cf440dcc053f6acba9d5548d5670c41
Fixes: 80328396
Bug: 80312809
Test: robotests