dt-bindings: arm: msm: kpss-acc: Revert "dt-bindings: arm: msm: kpss-acc: Make the...

dt-bindings: arm: msm: kpss-acc: Revert "dt-bindings: arm: msm: kpss-acc: Make the optional reg truly optional"

This reverts commit 981be238e1d28e156aa9da2a8722f86f02fd0453 because it
was totally bogus and duplicated existing minItems:

  ruamel.yaml.constructor.DuplicateKeyError: while constructing a mapping
  Documentation/devicetree/bindings/power/qcom,kpss-acc-v2.yaml: ignoring, error parsing file

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230724090109.19489-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>