clk: renesas: mstp: Use always-on governor for Clock Domain

As a pure Clock Domain does not have the concept of powering the domain
itself, the CPG/MSTP driver does not provide power_off() and power_on()
callbacks.
However, the genpd core may still perform a dummy power down, causing
/sys/kernel/debug/pm_genpd/pm_genpd_summary to report the domain's
status being "off-0".

Use the always-on governor to make sure the domain is never powered
down, and always shows up as "on" in pm_genpd_summary.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/clk/renesas/clk-mstp.c

@@ -319,7 +319,7 @@ void __init cpg_mstp_add_clk_domain(struct device_node *np)
 	pd->flags = GENPD_FLAG_PM_CLK;
 	pd->attach_dev = cpg_mstp_attach_dev;
 	pd->detach_dev = cpg_mstp_detach_dev;
-	pm_genpd_init(pd, &simple_qos_governor, false);
+	pm_genpd_init(pd, &pm_domain_always_on_gov, false);
 
 	of_genpd_add_provider_simple(np, pd);
 }