Cache device nodes within cpus do not have "reg" property, so should not
have unit address, as reported by dtc W=1 warnings:

  alpine-v3.dtsi:247.24-254.5: Warning (unit_address_vs_reg): /cpus/cache@0: node has a unit name, but no reg or ranges property
  alpine-v3.dtsi:256.26-263.5: Warning (unit_address_vs_reg): /cpus/cache@100: node has a unit name, but no reg or ranges property
  alpine-v3.dtsi:265.26-272.5: Warning (unit_address_vs_reg): /cpus/cache@200: node has a unit name, but no reg or ranges property
  alpine-v3.dtsi:274.26-281.5: Warning (unit_address_vs_reg): /cpus/cache@300: node has a unit name, but no reg or ranges property
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240402200744.79349-4-krzk@kernel.org