Use C99 types. u_int{8,16,32,64}_t to uint{8,16,32,64}_t.

No functional change.
Whitespace
Add full speed isoc support to ehci(4). Based on the patch posted in

https://mail-index.netbsd.org/port-arm/2013/04/14/msg001842.html

From Masao Uebayashi via Sebastien Bocahu
Use ASSERT_SLEEPABLE.
Remove #if 0 code.
Remove usbd_bus no_intrs member it was (virtually) unused.