soc: ti: ti_sci_pm_domains: check for proper args count in xlate

K2G devices still only use single parameter for power-domains property,
so check for this properly in the driver. Without this, every peripheral
fails to probe resulting in boot failure.

Link: https://lore.kernel.org/r/[e-mail]
Fixes: efa5c01cd7ee ("soc: ti: ti_sci_pm_domains: switch to use multiple genpds instead of one")
Reported-by: Nishanth Menon <[e-mail]>
Signed-off-by: Tero Kristo <[e-mail]>
Acked-by: Nishanth Menon <[e-mail]>
Acked-by: Santosh Shilimkar <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/soc/ti/ti_sci_pm_domains.c

···
 	struct genpd_onecell_data *genpd_data = data;
 	unsigned int idx = genpdspec->args[0];
 
-	if (genpdspec->args_count < 2)
+	if (genpdspec->args_count != 1 && genpdspec->args_count != 2)
 		return ERR_PTR(-EINVAL);
 
 	if (idx >= genpd_data->num_domains) {