* fix bug on spi driver

* [gd32] fix bugs on spi driver

修改drv_soft_i2c.h中I2C0_BUS_CONFIG定义错误问题。

* [compiler] 增加SConscript依赖标志 AddDepend

* RT_USING_NEWLIB->RT_USING_NEWLIBC RT_USING_ARM_LIBC->RT_USING_ARMLIBC

* 删除过时的板载测试例程

* [gd32] 移除无用的反汇编文件

* [bsp]移除老旧bsp中对RT_USING_NEWLIBC的手动宏定义

* [bsp][sconscript] 整理统一sconscript格式

* update

* update

* first copy

* [GD32][BSP]添加GD32303C-START开发板

* 更新yml文件

* 更新scons脚本

将__CC_ARM 替换成 __ARMCC_VERSION 用以支持AC6编译，通过gd32f303测试。

[gd32/arm/libraries]: correct pin number in drv_gpio.c; fix compile error if use rtc in gd32 f1~f4 (#6172)

* [gd32/libraries]: fix compile error in rtc: "pmu_backup_write_enable" was not found.

* [gd32/arm/libraries/gd32_drivers/drv_gpio.c] correct gpio number.

* [bsp/gd32]Optimize GD32 bsp architecture

将路径更新为IAR最新版本的路径

因为不确定后续IAR是否会像Keil一样内含有不同的编译工具链
此外，将判断条件改为列表方式，这样更方便后续增加其他可能的IAR编译链

* bug fixed gpio_mode_set miss gd32_spi->mosi_pin,gd32_spi->sck_pin
* feature,add gd32_spi's alt_func_num member for different spi periph's gpio
* feature,add spi3,spi4,and support multi spi devices
* feature,add rt_hw_spi_device_attach api
* tested on the gd32f450i-eval board

* [gcc][armcc][armclang] rtconfig.CROSS_TOOL->rtconfig.PLATFORM

* [bsp/gd32]Optimize UART

* [bsp/gd32]Optimize UART

frame

* [console] 解决在没有定义RT_USING_DEVICE的情况下使用device报错的问题

* format codes

* [libc] 整理格式

* refresh projects