Keep interrupts on when in battery saver mode

Battery saver was completely aborting the doze service, disabling
all interrupts. This is not ideal since it impacts the user journey,
especially when using face auth.

From now on the screen will still be off, but DozeService will be
retained, in order to receive sensor events.

Test: w/ battery saver: lift, tap, and observe aod being off
Test: w/ battery saver: receive notification, no HUN.
Test: w/o battery saver: lift, tap, and observe aod being on
Test: w/o battery saver: receive notification, HUN is received.
Fixes: 134157254
Change-Id: I9b713c78857c4e4c22d8d9bfff165b1b51dfd804
Merged-In: I9b713c78857c4e4c22d8d9bfff165b1b51dfd804
(cherry picked from commit 6edeb187015a04e7ff6a8f06275336b7e4ac82e7)
13 files changed