ARM: dts: keystone: move i2c0 device node from SoC to board files

I2C devices are not the part of Keystone SoC and have to be
defined in board DTS files.
Hence, move i2c0 EEPROM device node from Keystone SoC to
k2hk, k2e, k2l EVM files as they all have similar EEPROM SoCs
installed.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>