blackfin: license: Change ADI BSD license

Change ADI BSD license to standart 3 clause BSD license for some blackfin arch
code requested by ADI Legal.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

arch/blackfin/lib/memmove.S

@@ -1,7 +1,7 @@
 /*
  * Copyright 2005-2009 Analog Devices Inc.
  *
- * Licensed under the ADI BSD license or the GPL-2 (or later)
+ * Licensed under the Clear BSD license or the GPL-2 (or later)
  */
 
 #include <linux/linkage.h>