arm64: dts: qcom: msm8998-*: Fix up comments

Switch '//' comments to C-style /* */ and fix up the contents of some.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221107145522.6706-5-konrad.dybcio@linaro.org