uart_parse_options — Parse serial port baud/parity/bits/flow contro.
pointer to option string
pointer to an 'int' variable for the baud rate.
pointer to an 'int' variable for the parity.
pointer to an 'int' variable for the number of data bits.
pointer to an 'int' variable for the flow control character.
uart_parse_options decodes a string containing the serial console options. The format of the string is <baud><parity><bits><flow>,
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