ARM: dts: at91: at91-sama5d27_som1: Enable eeprom device

There is an EEPROM on at91-sama5d27_som1 connected to i2c0. i2c0 node
has to be moved from at91-sama5d27_som1_ek to at91-sama5d27_som1.

Enable the i2c EEPROM found on at91-sama5d27_som1. Add an alias for the
i2c node.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Tested-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20200403061222.1277147-5-tudor.ambarus@microchip.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>