iwlwifi: kill bus_is_pm_supported

Get this information from the transport layer which is now in charge
of the APM too.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-power.c b/drivers/net/wireless/iwlwifi/iwl-power.c
index c7394ef2..fd008c4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-power.c
+++ b/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -436,7 +436,7 @@
 /* initialize to default */
 void iwl_power_initialize(struct iwl_priv *priv)
 {
-	priv->power_data.bus_pm = bus_get_pm_support(bus(priv));
+	priv->power_data.bus_pm = trans(priv)->pm_support;
 
 	priv->power_data.debug_sleep_level_override = -1;