soc: qcom: smd-rpm: Add QCOM_SMD_RPM_STATE_NUM

Add a preprocessor define to indicate the number of RPM contexts/states.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Georgi Djakov <djakov@kernel.org>
Link: https://lore.kernel.org/r/20230526-topic-smd_icc-v7-2-09c78c175546@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>