ARM: imx: stm32: Test whether ethernet node is enabled before reading MAC EEPROM on DHSOM

Check whether the ethernet interface is enabled at all before reading
MAC EEPROM. As a cost saving measure, it can happen that the MAC EEPROM
is not populated on SoMs which do not use ethernet.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
5 files changed