common: allow disabling of timeout for password entry
In case a user has to enter a complicated password it is sometimes desireable to give the user more time than the default timeout. Enabling this feature will disable the timeout entirely in case the user presses the <Enter> key before entering any other character. Signed-off-by: NSteffen Jaeckel <jaeckel-floss@eyet-services.de> Reviewed-by: NSimon Glass <sjg@chromium.org>
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