arm64: dts: meson-axg: jethub-j1xx: Fix MAC address node names

Node names should use hyphens instead of underscores to not cause
warnings.

Fixes: 59ec069d ("arm64: dts: meson-axg: add support for JetHub D1p (j110)")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230111211350.1461860-4-martin.blumenstingl@googlemail.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>