fix lwip2.1.0 port bug

[bsp][stm32] optimize stm32 series BSP

Fixbug stm32f1xx_hal_can.h

[BSP] Fixed imxrt1050 gpio driver | 修复 imxrt1050 gpio 驱动

Update version number to v4.0.1

fix lwip2.1.0 port bug

Update changelog

[BSP] Remove the unnecessary STM32 BSP

[BSP] remove imxrt1052-evk and use imxrt later

[bsp][stm32f767-st-nucleo] Fix the eol.

Fix the end of line issue.

[bsp][synopsys] add the support of synopsys arc emsk

[bsp][stm32] add rtt head file to stm32lxx_hal.h for resolve scons error

[component][utest] 增加 utest 日志输出级别配置

Update board.c

Signed-off-by: NMurphyZhao <d2014zjt@163.com>

add the documenatation
Signed-off-by: NWayne Ren <wei.ren@synopsys.com>

* the initial support of synopsys designware arc processor
* the initial support of synospsy ARC EM Starter Kit
* the bsp code is based on embarc which is a common SDK for
all synopsys ARC-based boards
* use "scons --gdb" to debug emsk with em9d configuration
* for detailed board information, pls go embarc.org
Signed-off-by: NWayne Ren <wei.ren@synopsys.com>

[src][kservice.c] 修复 snprintf 中 `print_number` 函数错误解析 `%.0d` format 的问题

[DFS] Remove opened file check

Remove opened file check in dfs_file_open function. It will be replaced with POSIX flock/fcntl.

[Kernel] Fix rt_schedule_insert_thread issue

实现_sys_flen()函数并解决了unistd.h和dirent.h不能同时包含的问题。

When suspend current thread and then enable interrupt, it's possible resume "the current thread" immediately and insert to ready queue. The rt_schedule_insert_thread should change  the status of "current thread" to RUNNING statue.

[bsp][stm32] add STM32L0xx_HAL

[bsp][stm32]add stm32f107 bsp