interconnect: qcom: icc-rpm: Check for node-specific rate coefficients

interconnect: qcom: icc-rpm: Check for node-specific rate coefficients

Some nodes may have different coefficients than the general values for
bus they're attached to. Check for that and use them if present. See
[1], [2] for reference.

[1] https://github.com/sonyxperiadev/kernel/commit/7456d9779af9ad6bb9c7ee6f33d5c5a8d3648e24
[2] https://github.com/artem/android_kernel_sony_msm8996/commit/bf7a8985dcaf0eab5bc2562d2d6775e7e29c0f30
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230726-topic-icc_coeff-v4-4-c04b60caa467@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>