Revert "ubi: ensure that VID header offset + VID header size <= alloc, size"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8W70M


CVE: NA

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This reverts commit 45853252.

Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>