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This patch set uart_rts_gpios as an optional gpio pin. Some boards (e.g. px3se-sdk) do not use the rts flow control, and the correspoding uart-rts pin is occupied as some other functions(e.g. irq pin). Change-Id: Ia402dc2b74c305d83d3e1ccbedc1c913b270c828 Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>