bmw: Remove duplicated include of header file

Signed-off-by: Thomas Weber <weber@corscience.de>
diff --git a/board/bmw/bmw.c b/board/bmw/bmw.c
index 4039145..5ba6c09 100644
--- a/board/bmw/bmw.c
+++ b/board/bmw/bmw.c
@@ -22,7 +22,6 @@
  */
 
 #include <common.h>
-#include <common.h>
 #include <watchdog.h>
 #include <command.h>
 #include <malloc.h>