On the DXR2 board (AM335x using MUSB) the USB compliance test suite
(USB 2.0 Command Verifier) will cause the board to crash and reset
upon the "BOS Descriptor Test - Addressed state". Here the output
from the DRX2 while running this test:

GADGET DRIVER: usb_dnl_dfu
musb-hdrc: peripheral reset irq lost!
composite_setup (776)
data abort
pc : [<87f693ac>]          lr : [<87f6911c>]
sp : 86f33a58  ip : 00000000     fp : 86f3bbac
r10: 00000f00  r9 : 86f33ef4     r8 : 86f37da8
r7 : 00000005  r6 : 86f33a90     r5 : 00000000  r4 : 86f37e30
r3 : 00000000  r2 : 00000000     r1 : 87f9c888  r0 : 00000016
Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32
Resetting CPU ...

resetting ...

By adding the case statement for USB_DT_BOS and therefore not running
into the default case (jump to unkown label) this crash is fixed.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Roger Meier <r.meier@siemens.com>
Cc: Samuel Egli <samuel.egli@siemens.com>
Cc: Enrico Leto <enrico.leto@siemens.com>
Acked-by: Heiko Schocher <hs@denx.de>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>