libertas: move association code from join.c into scan.c

Besides code moving, I did the following changes:

* made some functions static
* removed some unneeded #include's
* made patch checkpatch.pl clean

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/scan.c b/drivers/net/wireless/libertas/scan.c
index 3825b79..1c7003d 100644
--- a/drivers/net/wireless/libertas/scan.c
+++ b/drivers/net/wireless/libertas/scan.c
@@ -19,7 +19,7 @@
 #include "decl.h"
 #include "dev.h"
 #include "scan.h"
-#include "join.h"
+#include "assoc.h"
 #include "cmd.h"
 
 //! Approximate amount of data needed to pass a scan result back to iwlist