mfd: omap-usb-host: Use match_string() helper
match_string() returns the index of an array for a matching string, which can be used intead of open coded variant. Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com> Acked-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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