USB: serial: cp210x: clean up CRTSCTS flag code
The CRTSCTS flag code cleared (and inconsistently) bits unrelated to CRTSCTS functionality. It was also harder than necessary to read. Signed-off-by: NKonstantin Shkolnyy <konstantin.shkolnyy@gmail.com> Signed-off-by: NJohan Hovold <johan@kernel.org>
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