EEPROM的设备框架

从源码上看，rt-thread还没有一个EEPROM的设备框架，是否考虑新增这个。关于memory的设备目前已经有了设备类型RT_Device_Class_MTD和RT_Device_Class_Block，但从这两个设备的API看来，主要还是面向Flash型的设备。
软件包到是有一个AT24Cxx，可能已经支持市面上很多EEPROM（很多非ATmal的也可以使用），但API的命名上还是以AT24为，在实际的项目中，可能还是容易造成误解，所以建议增加一个EEPROM的设备框架。
`#ifndef RT_EEPROM_H
#define RT_EEPROM_H

#include <rtthread.h>
#include <rtdevice.h>

struct rt_eeprom_ops
{
rt_err_t (*init)(rt_device_t dev);
rt_err_t (*write)(rt_device_t dev, rt_uint32_t addr, void *data, rt_size_t size);
rt_err_t (*read)(rt_device_t dev, rt_uint32_t addr, void *data, rt_size_t size);
rt_err_t (*control)(rt_device_t dev, rt_uint32_t cmd, void *arg);
rt_err_t (*close)(rt_device_t dev);
};

struct rt_eeprom_dev
{
struct rt_device parent;
struct rt_eeprom_ops *ops;
};

typedef struct rt_eeprom_dev rt_eeprom_t;

rt_size_t rt_eeprom_write(rt_device_t dev, rt_uint32_t addr, void *data, rt_size_t size);
rt_size_t rt_eeprom_read(rt_device_t dev, rt_uint32_t addr, void *data, rt_size_t size);
rt_err_t rt_eeprom_device_register(rt_eeprom_t *dev, char *name, void *user_data);

#endif /* RT_EEPROM_H */`

Start by reviewing the existing RT_Device_Class_MTD and RT_Device_Class_Block APIs, then inspect the AT24Cxx package mentioned in the issue. The issue does not name files or tests; completion would require an agreed EEPROM device abstraction and a clear integration path for supported EEPROM devices.