dt-bindings: interconnect: qcom: Fix and separate out MSM8996

Separate out MSM8996 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-v2-4-e33d5acbf3bd@linaro.org


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