arm64: dts: airoha: en7581: Add more nodes to EN7581 SoC evaluation board

arm64: dts: airoha: en7581: Add more nodes to EN7581 SoC evaluation board

Introduce the following nodes to EN7581 SoC and EN7581 evaluation board:
- rng controller
- pinctrl
- i2c controllers

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250221-en7581-dts-spi-pinctrl-v3-1-4719e2d01555@kernel.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>