BangLang Huang c446ee4ad4 nvram: add usage() function
Merge the help message into a single function,
so that we can use it somewhere else.

Signed-off-by: BangLang Huang <banglang.huang@foxmail.com>
(cherry picked from commit 2a253e7cdbacd1bd19da80ea6f35a93b42655c3b)
2017-12-13 16:23:39 +01:00
..
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