* Add Microchip SAM series MCU support for RT-Thread
Add Microchip SAM series MCU support for RT-Thread, including SAM Cortex-M0+, M4F and M7.
* Add bsp directory to ignored check list
Add bsp directory to ignored check list, add microchip /samc21/same54/same70 to workflows list
* remove STDIO definition and bug fix
1. remove STDIO code from Microchip official BSP. 2. bug fix of SAME70 hpl/hpl_usart.c, samc21&same54 hpl/hpl_sercom.c baudrate update interface. 3. Add RT-Thread standard STDIO implementation on Microchip SAM MCU.
* add CAN driver & example and script fix
Add CAN driver and example for SAMC21/SAME5x/SAME70 and fix rtconfig.py issue(unused space might result link error)
* Add Chinese version README
Add Chinese version README for SAMC21/E54/E70
feat: move MRS demo source to bsp and libraries folder
feat: update Sconscript
feat: modify SConstruct in the bsp
feat: use the rtconfig.py of gd32vf103v-eval bsp to modify
feat: use the MRS's rtconfig.h temoporarily
feat: update Kconfig files
feat: use the MRS's .ld and rename as link.lds
feat: add ch32v1 porting folder
perf: remove board/system_ch32v10x.c
fix: define SOC_ARM_SERIES_CH32V103 in rtconfig.h
fix: add some neccessary macros in rtconfig.h
perf: use the menuconfig to generate rtconfig.h
feat: add readme.md
fix: correct the bad encode in main.c
fix: include board.h in main.c
perf: check and update README.md
perf: remove ch32f10x_port_cn.md
feat: ignore the standard libraries's CI checking
feat: add sdk_dist.py
fix: correct some style errors again
perf: simply the board/kconfig
fix: format ch32v103r-evt
fix: format drvs and libcpu
* [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.