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implemented the software I2C drivers for the AVR32 target.
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合入基于 CherryUSB 的 XCHI 和 PUSB2 驱动
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更新驱动代码，完成对新版rt-thread内核的支持工作。更新默认config文件，保证各驱动被顺利添加后，程序能正常运行
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- G0
- G4
- L0
- L4
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stm32 BSPs to support nano version (RT_USING_NANO)
这个commit支持到stm32f7之前的BSP
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- move all normal drivers (devices framework drivers) into drivers
folder.
- create nano folder for nano drivers
nano drivers are only for a simply wrap of the HAL function, and
not seek for adopting rt-thread devcies framework.
- provide unified nano console and GPIO drivers.
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Document ：UART7 -> UART9 (#8275)
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1: If IAP has set mstatus to other value, using csrs will not change old value of mstatus in IAP. It should using csrw instead.
2: Reduce the flash size of undefined irq functions.
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**为什么提交这份PR (why to submit this PR)**
1. hc32驱动函数和rtt函数声明之间的参数类型不一致，在mdk编译时产生警告。
2. hc32的can设备，在注册时就把can中断使能了。导致can设备在打开前，就会产生中断。
3. hc32的pwm驱动，不支持PWM_CMD_SET_PERIOD和PWM_CMD_SET_PULSE指令，导致rt_pwm_set_pulse()函数返回失败。
**你的解决方案是什么 (what is your solution)**
1. 修改hc32驱动函数参数类型和声明一致。
2. 注册can设备时主动禁止can中断，因为打开设备时会主动打开中断。
3. 修改pwm驱动，增加PWM_CMD_SET_PERIOD和PWM_CMD_SET_PULSE指令支持。
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drivers (#8245)
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