fix wrong sleep entry for display state change

- a missing break in switch - case brought the issue.
- remove rearview camera case from PowerManagement :
  android display will be kept on, so there is no need to
  handle rear view camera case specially.
- fix possible bug of checking display on. Only handle
  DISPLAY_ON to on.

bug: 27142874, 26718816

Change-Id: Ie5a804be434a466cc67d81725ee2e9c56e693d5f
2 files changed