iwlagn: iwl-pci doesn't include iwl-dev any more

Move all the iwlXXX_abgn_cfg forward declaration to a separate file
so that iwl-pci.c doesn't need to include iwl-agn.h that includes
all iwl-dev.h
This allows to provide real encapsulation. Dereferencing iwl_priv
in the bus layer will now lead to a compilation error.

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-2000.c b/drivers/net/wireless/iwlwifi/iwl-2000.c
index 047c22b6..75ded34 100644
--- a/drivers/net/wireless/iwlwifi/iwl-2000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-2000.c
@@ -45,6 +45,7 @@
 #include "iwl-agn-hw.h"
 #include "iwl-6000-hw.h"
 #include "iwl-shared.h"
+#include "iwl-pci.h"
 
 /* Highest firmware API version supported */
 #define IWL2030_UCODE_API_MAX 6