Acquire display suspend blocker for DozeService

If DozeService explicitly requests the display state to be on,
then PowerManager needs to acquire the display suspend blocker even
while in DOZE mode to prevent the system from constantly trying
to suspend.

Bug: 138195405
Test: atest PowerManagerServiceTest
Change-Id: I05f5b86789ced084d0814480b2fe89d74f96a54e