[driver][soft-spi] spi device driver framework adds pin init function function

为什么提交这份PR (why to submit this PR)
ps：在设备初始化阶段不应该存在对硬件的操作

你的解决方案是什么 (what is your solution)
ps：添加一个pin_init函数，在spi设备使用时调用该函数来完成硬件引脚的状态初始化，而不是在设备初始化阶段对硬件进行操作，已经在瑞萨HMI上通过验证

components/drivers/spi/spi-bit-ops.c

@@ -384,6 +384,11 @@ rt_err_t spi_bit_configure(struct rt_spi_device *device, struct rt_spi_configura
     RT_ASSERT(device != RT_NULL);
     RT_ASSERT(configuration != RT_NULL);
 
+    if(ops->pin_init != RT_NULL)
+    {
+        ops->pin_init();
+    }
+
     if (configuration->mode & RT_SPI_SLAVE)
     {
         return -RT_EIO;

components/drivers/spi/spi-bit-ops.h

@@ -21,6 +21,7 @@ extern "C" {
 struct rt_spi_bit_ops
 {
     void *data;            /* private data for lowlevel routines */
+    void (*const pin_init)(void);
     void (*const tog_sclk)(void *data);
     void (*const set_sclk)(void *data, rt_int32_t state);
     void (*const set_mosi)(void *data, rt_int32_t state);