staging/android: prepare sw_sync files for de-staging

remove file paths in the comments and add short description about each
file.

v2: remove file paths instead of just change them.

v3: improve header description as sugggested by Eric

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/android/sw_sync.c b/drivers/staging/android/sw_sync.c
index 92c1f8b1..039e1f4 100644
--- a/drivers/staging/android/sw_sync.c
+++ b/drivers/staging/android/sw_sync.c
@@ -1,5 +1,5 @@
 /*
- * drivers/dma-buf/sw_sync.c
+ * Sync File validation framework
  *
  * Copyright (C) 2012 Google, Inc.
  *