ARM: dts: stm32: Add nvmem-cells to ethernet nodes for constant mac-addresses

ARM: dts: stm32: Add nvmem-cells to ethernet nodes for constant mac-addresses

The efuse device tree description already has the two labels pointing to
the efuse nodes that specify the mac-addresses to be used. Wire them up
to the ethernet nodes. This is enough to make barebox pick the right
mac-addresses and pass them to Linux.

Suggested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20250328171406.3307778-2-u.kleine-koenig@baylibre.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>