config: set default value of CONFIG_TEST_FREE_PAGES

hulk inclusion
category:feature
bugzilla: 43588
CVE: NA

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set default value of CONFIG_TEST_FREE_PAGES

Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>