ALSA: usb-audio: Add endianness annotations

Fixes: 4b8ea38f ("ALSA: usb-audio: Support jack detection on Dell dock")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202207051932.qUilU0am-lkp@intel.com


Signed-off-by: Jan Schär <jan@jschaer.ch>
Link: https://lore.kernel.org/r/20220705135746.13713-1-jan@jschaer.ch


Signed-off-by: Takashi Iwai <tiwai@suse.de>