Major USB fixes by Frank Gevaerts. Still disabled in builds, #define USE_ROCKBOX_USB to test.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16279 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 7c95ab8..955b811 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -368,6 +368,7 @@
 Apoorva Mahajan
 Vuong Minh Hiep
 Mateusz Kubica
+Frank Gevaerts
 
 The libmad team
 The wavpack team