Fix a use-after-free bug in AttributionProcessor::OnWakelockReleased

There is a use-after-free bug in AttributionProcessor::OnWakelockReleased
resulted from a well-known misuse of using iterators to delete
items in containers (the deleted items are used for calculating the next iterator
in the next round). This patch fix it with correct usage.

see the regression test is in I1709af943b6fa238dd4df41a62e6add36984c9ec

Bug: 254774758
Ignore-AOSP-First: security
Test: atest bluetooth_test_gd_unit

Change-Id: If9f14d5fe2fbf2150f2ab0d1f90ce0f263399227