dt-bindings: interconnect: qcom,bwmon: Document SC7180 BWMONs

SC7180 - just like SC7280 - has a BWMONv4 for CPU-LLCC and a BWMONv5
for DDR-LLCC paths. Document them.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230616-topic-sc7180_bwmons-v1-1-4ddb96f9a6cd@linaro.org


Signed-off-by: Georgi Djakov <djakov@kernel.org>