dt-bindings: phy: rockchip: add rk3576 compatible

Adds the compatible line to support RK3576 SoC.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241106021357.19782-1-frawang.cn@gmail.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>