Fix the following ECC reported errors in SsdtSerialPortFixupLib. - [9002] The function headers should follow Doxygen special documentation blocks in section 2.3.5 in Comment, <@param [in]> does NOT have [in, out] Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> Reviewed-by: Alexei Fedorov <Alexei.Fedorov@arm.com>