dt-bindings: interconnect: qcom: Fix and separate out SDM660

Separate out SDM660 icc bindings from the common file and fix the
clocks description by removing the wrong internal RPM bus clock
representation that we've been carrying for years.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230721-topic-icc_bindings-v2-3-e33d5acbf3bd@linaro.org


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