arm64: dts: qcom: sdm845-oneplus: drop invalid panel properties

Panel does not have children with unit-addresses thus address/size-cells
are not valid:

  panel@0: '#address-cells', '#size-cells' do not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230326155753.92007-9-krzysztof.kozlowski@linaro.org