Revert "perf: Paper over the hw.target problems"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I53VHE
CVE: NA

--------------------------------

This reverts commit 03804742.

This patch is used to solve race between close() and fork() of the perf.
However, this patch is not accepted by the community. As a result,
destory interface is incorrectly invoked during the perf_remove_from_context,
causing UAF, see https://lkml.org/lkml/2019/6/28/856

.

For 4.19 kernel, he final fix patch has been incorporated, see eb41044b.
Therefore, need to revert the patch.

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Reviewed-by: Kuohai Xu <xukuohai@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>