arm64: dts: rockchip: Use phandle for i2c_lvds_blc on rk3368-lion haikou

arm64: dts: rockchip: Use phandle for i2c_lvds_blc on rk3368-lion haikou

i2c@0 on i2cmux2 does already have a phandle i2c_lvds_blc defined.

Use this one instead of replicating the hierarchy again, as this might
result in strange errors if the lion dtsi is changed at some point
in the future.

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Link: https://patch.msgid.link/20260114230707.4175162-2-heiko@sntech.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>