[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>

bsp/wch/risc-v/Libraries/ch32_drivers/drv_pwm.h

+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-10-20     MXH          the first version
+ */
+
+#ifndef __DRV_PWM_H__
+#define __DRV_PWM_H__
+
+#include <rtthread.h>
+#ifdef BSP_USING_PWM
+#include "ch32v30x_tim.h"
+#include <drivers/rt_drv_pwm.h>
+#include <drivers/hwtimer.h>
+#include <board.h>
+
+#ifndef ITEM_NUM
+#define ITEM_NUM(items) sizeof(items) / sizeof(items[0])
+#endif
+
+#define MAX_COUNTER     65535
+#define MIN_COUNTER     2
+#define MIN_PULSE       2
+#define FLAG_NOT_INIT   0xFF
+
+struct rtdevice_pwm_device
+{
+    struct rt_device_pwm parent;
+    TIM_TypeDef* periph;
+    rt_uint8_t channel[4];
+    char* name;
+};
+
+#endif/* BSP_USING_PWM */
+
+#endif/* __DRV_PWM_H__ */