Don't call setPowerBoost directly from native code

android_server_PowerManagerService_userActivity may call setPowerBoost
twice, one is from native, another is from Java.
This is unnecessary, and Java side has more callers and has own
throttle, so this change removes directly calling setPowerBoost from
native code.

Bug: 306012591
Test: presubmit
Change-Id: I5ba262719c2d361d80c598cb28e5c5ab066efb0f