* 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>