iwlwifi: move HT_IE_EXT_CHANNEL_* driver definitions to iwl-4965.h

Move HT_IE_EXT_CHANNEL_* driver definitions to iwl-4965.h

Add comments to guide .h file usage (hw/api/driver definitions)

Minor comment cleanup

Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.h b/drivers/net/wireless/iwlwifi/iwl-3945.h
index 2f3a8b4..75cef3ed 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.h
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.h
@@ -23,6 +23,11 @@
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  *****************************************************************************/
+/*
+ * Please use this file (iwl-3945.h) for driver implementation definitions.
+ * Please use iwl-3945-commands.h for uCode API definitions.
+ * Please use iwl-3945-hw.h for hardware-related definitions.
+ */
 
 #ifndef __iwl_3945_h__
 #define __iwl_3945_h__