Loose the requirement on checking duration for ADPF GPU flag off

Previously we set the GPU start time at time when fence is returned,
which can make it more than 1ms closer to the fence signal time than
reality.

Bug: 354443067
Flag: TEST_ONLY
Test: atest PowerAdvisorTest
Change-Id: I5e454cee2f2f10488d49bd33026607323e3578d6