* cdl/usb_serial.cdl: Place static endpoint struct options in a CDL component. * src/usbs_serial.c: Use usbs_get_[tr]x_endpoint() when static endpoint structs are disabled. [ Bugzilla 1001024 ] * tests/usbserial_echo.c, tests/usb2serial.c: Eliminate inclusion of the AT91 USB slave driver header file. * doc/usbs_serial.sgml: Mention the new static endpoint struct CDL component.