[kernel,cmds] Fix tty SIGINT not handled when using sercat #2001
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Fixes ^C not terminating
sercatfound by @RNRetailer discussed in #1974 (comment).Also changed
sercatso that when run with no arguments, /dev/ttyS0 is automatically selected for the serial port, when run from the direct console. When run from a serial port, that serial port will be selected, otherwise a command argument must be specified.sercatwill either terminate when ^D is received from the serial port, or additionally, if not being run from a serial port, a ^C will terminate the program.