pmdomain: qcom: rpmhpd: Drop the ->opp_to_performance_state() callback

Since commit 7c41cdcd ("OPP: Simplify the over-designed pstate <->
level dance"), there is no longer any need for genpd providers to assign
the ->opp_to_performance_state(), hence let's drop it.

Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: linux-arm-msm@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231012153607.101465-1-ulf.hansson@linaro.org

drivers/pmdomain/qcom/rpmhpd.c

@@ -743,12 +743,6 @@ static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
 	return ret;
 }
 
-static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
-						 struct dev_pm_opp *opp)
-{
-	return dev_pm_opp_get_level(opp);
-}
-
 static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
 {
 	int i;
@@ -838,7 +832,6 @@ static int rpmhpd_probe(struct platform_device *pdev)
 		rpmhpds[i]->pd.power_off = rpmhpd_power_off;
 		rpmhpds[i]->pd.power_on = rpmhpd_power_on;
 		rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
-		rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
 		pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
 
 		data->domains[i] = &rpmhpds[i]->pd;