【1】添加ch32v208-r0 bsp
【2】合并libcpu/riscv 下ch系列mcu的port文件

* 对接了rt_hw_context_switch_interruptC(rt_ubase_t from, rt_ubase_t to, rt_thread_t from_thread, rt_thread_t to_thread)接口

* Update libcpu/risc-v/ch32v1/cpuport.c
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

* [dfs] sync cromfs

* [rt-smart]Weaken RT_USING_LWP, use RT_USING_SMART as macro configuration

* [format] fix some format issue.

* [rtdef] rename RT_WEAK attribute as rt_weak

* [rtdef] rename RT_USED attribute as rt_used

* [rtdef] rename RT_SECTION attribute as rt_section

* [rtdef] rename ALIGN attribute as rt_align

* [legacy] add RT_USED ALIGN RT_SECTION RT_WEAK as legacy support

* [risc-v/libcpu] porting Smart & RTOS
* [fix] rv64 plic
* [risc-v/rv64] remove macro in rtdef

* add core-v-mcu bsp

* 规范bsp格式 添加readme

* 修改readme

Co-authored-by: 1516081466@qq.com <ws051000>

* Synchronize the code of the rt mart branch to the master branch.
  * TTY device
  * Add lwP code from rt-smart
  * Add vnode in DFS, but DFS will be re-write for rt-smart
  * There are three libcpu for rt-smart:
    * arm/cortex-a, arm/aarch64
    * riscv64
Co-authored-by: NRbb666 <zhangbingru@rt-thread.com>
Co-authored-by: Nzhkag <zhkag@foxmail.com>

* Add CANFD support and correct typos

- Added CANFD required fields to can.h
- Fixed typos in can.h and can.c
- Corrected all the projects affected by the typo
- Fixed wrong line-ending in some affected can driver files
Signed-off-by: NFan YANG <fan.yang@hpmicro.com>

* update

* bsp: support boards from hpmicro

- Supported HPM6750EVKMINI
- Supported HPM6750EVK
Signed-off-by: NFan YANG <fan.yang@hpmicro.com>
Signed-off-by: NFan YANG <fan.yang@hpmicro.com>
Co-authored-by: Meco Man <920369182@qq.com>

WCH CH569W-R0-1v0 evt board bsp port, first version

dev/test under Ubuntu 20.04
toolchain from MounRiver_Studio_Community_Linux_x64_V120

tested drivers : SysTick, gpio, gpio interrupt, uart1 (RX interrupt, TX polling)

libcpu/risc-v/SConscript :
group includes rtconfig.CPU only if folder exists

libcpu/risc-v/common/cpuport.c/rt_hw_context_switch_interrupt() :
make it RT_WEAK for customization

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

使用不同的优化等级会出现不同的效果
当使用-O0 等级时，无法正确得到关闭中断之前的状态

Using different optimization levels will have different effects
When the - o0 level is used, the state before the shutdown interrupt cannot be obtained correctly

previous rt_hw_context_switch might cause the
task switch handling error.

See
https://github.com/Nuclei-Software/nuclei-sdk/commit/1a1a209e9363840d372c04b84ce733ea6b6e79f2#diff-ba922e02206af6c52163f0c34a7e76e427b7ea22f791329b62f2069241c57778Signed-off-by: Huaqi Fang <578567190@qq.com>

add qemu-riscv-virt64 bsp