完善 Serial V2 框架 (#5770)
* [stm32] fix h7 uart V2 driver unused code. * [DeviceDriver][serialv2] fix the serialv2 when using for console device on DMA mode. * [stm32][art-pi] using serial v2 by default * [DeviceDriver][SerialV2] Add termios for serial@V2 . * [BSP][STM32] Add hardware flow control for STM32 serial@V2 driver. * [DeviceDriver][Serial@V2] Add hardware flow control for serial V2.
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