ARM: dts: at91: sam9x60ek: fix eeprom compatible

The memory on this board is microchip 24aa025e48 which is compatible with
at24c02 with a page size of 16.
Fix the compatible accordingly.

Reported-by: Sergiu Moga <sergiu.moga@microchip.com>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Tested-by: Sergiu Moga <sergiu.moga@microchip.com>
Reviewed-by: Heiko Schocher <hs@denx.de>