Revert "modpost: add read_text_file() and get_line() helpers"

hulk inclusion
category: bugfix
bugzilla: 46847
CVE: NA

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This reverts commit 18aa51a2f1e0a47bd959af44140bd6a6c06c90d8.

This series of patches could raise an issue on module built.

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
Reviewed-by: Jian Cheng <cj.chengjian@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>