ARM: dts: vf610-zii-dev-rev-c: Fix the I2C EEPROM address

at24mac602 should be at the I2C address 0x50, so that it matches the
'reg' property.

Fixes: d4cd1581 ("ARM: dts: vf610-zii-dev: Add .dts file for rev. C")
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>