PowerManager: change performance profile when disabling battery saver

We need to be sure to update the performance profile when the system
disables battery saver mode.

This fixes the perf tile becoming out of sync - changing it to low power
mode triggers power saver, but turning power saver off does not trigger
the tile.

Ref: CYNGNOS-1156

Change-Id: I98168c23ed301372ee897bc74a807eff2ad4d683
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit 1f73e252)