* [renesas/ra2l1-cpk] add Captouch板载触摸按键配置说明.md

* Update Captouch板载触摸按键配置说明.md

* [renesas/drv_wdt.c] Fix error code issues
[renesas/drv_i2c.c] add hardware i2c driver

* [update] drv_wdt.c,drv_i2c.c
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

- 添加 RA 系列 BSP 开发教程
  - 添加 ra6m4-iot PPP 上网
  - 整理 驱动文件

[add] 添加 SPI、flash、ADC、DAC 说明文档