arm64: dts: qcom: sc8280xp-x13s: Fix up comments

Switch '//' comments to C-style /* */.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221107145522.6706-6-konrad.dybcio@linaro.org