eeprom: sunxi: Move the SID driver to the eeprom framework

Now that we have the EEPROM framework, we can consolidate the common driver
code. Move the driver to the framework, and hopefully, it will fix the sysfs
file creation race.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[srinivas.kandagatla: Moved to regmap based EEPROM framework]
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>