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

Since commit 7c41cdc ("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/20231012153558.101445-1-ulf.hansson@linaro.org

Author: Ulf Hansson

drivers/pmdomain/qcom/rpmpd.c

@@ -908,12 +908,6 @@ static int rpmpd_set_performance(struct generic_pm_domain *domain,
 	return ret;
 }
 
-static unsigned int rpmpd_get_performance(struct generic_pm_domain *genpd,
-					  struct dev_pm_opp *opp)
-{
-	return dev_pm_opp_get_level(opp);
-}
-
 static int rpmpd_probe(struct platform_device *pdev)
 {
 	int i;
@@ -959,7 +953,6 @@ static int rpmpd_probe(struct platform_device *pdev)
 		rpmpds[i]->pd.power_off = rpmpd_power_off;
 		rpmpds[i]->pd.power_on = rpmpd_power_on;
 		rpmpds[i]->pd.set_performance_state = rpmpd_set_performance;
-		rpmpds[i]->pd.opp_to_performance_state = rpmpd_get_performance;
 		pm_genpd_init(&rpmpds[i]->pd, NULL, true);
 
 		data->domains[i] = &rpmpds[i]->pd;