hw/nvram/eeprom_at24c: Remove ERR macro that calls fprintf to stderr

hw/nvram/eeprom_at24c: Remove ERR macro that calls fprintf to stderr

In the realize method error_setg can be used like other places there
already do. The other usage can be replaced with error_report which is
the preferred way instead of directly printing to stderr.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <637b92984795a385b648a84208f093947cc261e4.1740839457.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>