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Revise try_receive_message_by_uart to read one char from uart one time. With this implementation each char can be checked. This can be used to address the following 2 problems: 1) nosie data: it is found that there is noise data in the uart from guest VM when guest startup. 2) split multiple commands Tracked-On: #8111 Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>