[bsp][ch32v307]补全PWM设备，并为每个PWM设备添加条件编译，减少代码量 (#6548)
* 新增硬件定时器功能
* 新增定时器功能
* Update Kconfig
* Update bsp/wch/risc-v/Libraries/ch32_drivers/drv_hwtimer.h
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>
* Update Kconfig
* 添加剩余的PWM设备，并为每个PWM设备添加条件编译，减少代码量
* Update drv_pwm.c
* 根据建议进行修改
* 已根据建议修改
* Update bsp/wch/risc-v/Libraries/ch32_drivers/drv_pwm.c
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>
* Update bsp/wch/risc-v/Libraries/ch32_drivers/drv_pwm.h
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>
* Update bsp/wch/risc-v/Libraries/ch32_drivers/drv_pwm.c
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>
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