iwlagn: add missing includes

a few h files weren't self contained. Fix that.
Move iwl_dma_ptr to transport layer since it is not used by the upper layer
any more.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-shared.h b/drivers/net/wireless/iwlwifi/iwl-shared.h
index 7145e48..45f8a33 100644
--- a/drivers/net/wireless/iwlwifi/iwl-shared.h
+++ b/drivers/net/wireless/iwlwifi/iwl-shared.h
@@ -63,6 +63,11 @@
 #ifndef __iwl_shared_h__
 #define __iwl_shared_h__
 
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/gfp.h>
+
 /*This files includes all the types / functions that are exported by the
  * upper layer to the bus and transport layer */