Merge "Add null check in PowerAdvisor::supportsPowerHintSession"

    if (!mSupportsPowerHint.has_value()) {

        std::lock_guard lock(mPowerHalMutex);

        HalWrapper* const halWrapper = getPowerHal();

        mSupportsPowerHint = halWrapper->supportsPowerHintSession();

        mSupportsPowerHint = halWrapper && halWrapper->supportsPowerHintSession();

    }

    return *mSupportsPowerHint;

}