iwlwlifi: update rx write pointer w/o request mac access in the CAM mode

In iwl_rx_queue_update_write_ptr function
replace iwl_write_direct32 with iwl_write32 when not in power save mode.
We don't have to go through grab nic access as the NIC is already awake.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-rx.c

@@ -153,7 +153,7 @@ void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q
 	} else {
 		/* Device expects a multiple of 8 */
 		q->write_actual = (q->write & ~0x7);
-		iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
+		iwl_write32(priv, rx_wrt_ptr_reg, q->write_actual);
 	}
 
 	q->need_update = 0;