include: Add LF copyright to flash.h

flash.h was modified by commit d1478ac4de9ef69137d804606b0bff21909a0d85
but LF copyright was not added to it. Address this now.

Change-Id: I96d260835fada6b3c971f2e1c155cc94e42a3495
diff --git a/include/dev/flash.h b/include/dev/flash.h
index f2b10db..25257f1 100644
--- a/include/dev/flash.h
+++ b/include/dev/flash.h
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
  * Copyright (c) 2008, Google Inc.
  * All rights reserved.
  *