printk: Replace strncmp() with str_has_prefix()

strncmp(str, const, len) is error-prone because len is easy to have typo.
An example is the hard-coded len has counting error or sizeof(const)
forgets - 1.

So we prefer using newly introduced str_has_prefix() to substitute
such strncmp() to make code better.

Link: http://lkml.kernel.org/r/[email protected]
Cc: "Steven Rostedt" <[email protected]>
Cc: [email protected]
Signed-off-by: Chuhong Yuan <[email protected]>
Reviewed-by:  Sergey Senozhatsky <[email protected]>
[[email protected]: Slightly updated and reformatted the commit message.]
Signed-off-by: Petr Mladek <[email protected]>

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