ARM: dts: lpc3250-phy3250: rename nodename at@0 to eeprom@0

ARM: dts: lpc3250-phy3250: rename nodename at@0 to eeprom@0

Rename nodename at@0 to eeprom@0 to fix below CHECK_DTBS warnings:
arch/arm/boot/dts/nxp/lpc/lpc3250-phy3250.dtb: at25@0 (atmel,at25): $nodename: 'anyOf' conditional failed, one must be fixed:
	'at25@0' does not match '^eeprom@[0-9a-f]{1,2}$'
	'at25@0' does not match '^fram@[0-9a-f]{1,2}$'

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>