ARM: dts: renesas: r9a06g032-rzn1d400-eb: Add GMAC1 port

ARM: dts: renesas: r9a06g032-rzn1d400-eb: Add GMAC1 port

This port bypasses the switch and is directly connected to the GMAC.

Co-developed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250414100206.7185-2-wsa+renesas@sang-engineering.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>