pmdomain: core: Update the rejected/usage counters at system suspend too

During system suspend we may try to enter a low power-state for the genpd
in question. Let's take this into account for the statistics too, by
updating the rejected/usage counters for the corresponding state.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20240412104208.74361-1-ulf.hansson@linaro.org