[RESTRICT AUTOMERGE] Fix possible uaf of play policy state

Access to the play policy state may happen after
the state is freed in a race condition, which will
result in a SIGARBT.

SafetyNet logging is not added to avoid log spamming.
queryKeyStatus can be called often.

The crash was reproduced on the device before the fix.
Verified the test passes after the fix.

Test: sts-tradefed
  sts-tradefed run sts-engbuild-no-spl-lock -m StsHostTestCases --test android.security.sts.Bug_176486806#testPocBug_176486806

Test: push to device with target_hwasan-userdebug build
  adb shell /data/local/tmp/Bug-17648680664

Test: sts-tradefed
  sts-tradefed run sts-engbuild-no-spl-lock -m StsHostTestCases --test android.security.sts.Bug_176444154#testPocBug_176444154

Test: push to device with target_hwasan-userdebug build
  adb shell /data/local/tmp/Bug-17644415464

Bug: 176444154
Bug: 176486806
Change-Id: Ibd318068bf9e5d334f2d5a9af97ba5a2136adc04