Revert "modpost: use read_text_file() and get_line() for reading text files"

hulk inclusion
category: bugfix
bugzilla: 46847
CVE: NA

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This reverts commit 0294076e7271eb007c1f9c48733a4ebba55d0064.

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>