soc/tegra: pmc: Use consistent naming for PM domains

The various error messages refer to the PM domains as "power domain",
"genpd" and "PM domain". That's confusing, so convert all error messages
to use the most prominent: "PM domain".
Acked-by: NJon Hunter <jonathanh@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/soc/tegra/pmc.c

@@ -865,19 +865,19 @@ static void tegra_powergate_add(struct tegra_pmc *pmc, struct device_node *np)
 
 	err = pm_genpd_init(&pg->genpd, NULL, off);
 	if (err < 0) {
-		pr_err("failed to initialise power domain %s: %d\n", np->name,
+		pr_err("failed to initialise PM domain %s: %d\n", np->name,
 		       err);
 		goto remove_resets;
 	}
 
 	err = of_genpd_add_provider_simple(np, &pg->genpd);
 	if (err < 0) {
-		pr_err("failed to add genpd provider for %s: %d\n", np->name,
-		       err);
+		pr_err("failed to add PM domain provider for %s: %d\n",
+		       np->name, err);
 		goto remove_genpd;
 	}
 
-	pr_debug("added power domain %s\n", pg->genpd.name);
+	pr_debug("added PM domain %s\n", pg->genpd.name);
 
 	return;