as3525v2-usb: fix bug in ep listing macro, rewrite EP0 handling using a state

There was a stupid bug in endpoint listing which caused random cancelling of EP0 transfers. The new scheme to handle EP0 transfers should avoid an unexpected setup packet which might cause a deadlock or confuse the core.
There is still an issue with the cancel_transfers function is still.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27178 a1c6a512-1295-4272-9138-f99709370657
1 file changed