"soc" node has "ranges" property thus add matching unit address to fix
dtc W=1 warnings:

  rtd139x.dtsi:50.6-120.4: Warning (unit_address_vs_reg): /soc: node has a reg or ranges property, but no unit name
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240401140912.97157-2-krzk@kernel.org