ARM: dts: imx27-phytec: Use eeprom as the node name

ARM: dts: imx27-phytec: Use eeprom as the node name

Node names should be generic, so use 'eeprom' to fix the
following schema warnings:

 at24@52: $nodename:0: 'at24@52' does not match '^eeprom@[0-9a-f]{1,2}$'
	from schema $id: http://devicetree.org/schemas/eeprom/at24.yaml#

Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>