arm64: dts: qcom: sm8150: drop incorrect serial properties

Drop incorrect and unused serial properties - address/size-cells and
reg-names:

  sa8155p-adp.dtb: geniqup@ac0000: serial@a84000: Unevaluated properties are not allowed ('#address-cells', '#size-cells', 'reg-names' were unexpected)

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230417080818.28398-1-krzysztof.kozlowski@linaro.org