can: peak_usb: mark expected switch fall-throughs

Status from this message: applied to linux-can-next.

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#	Subject and files	Size	Replies	Applied
1/1	can: peak_usb: mark expected switch fall-throughs`drivers/net/can/usb/peak_usb/pcan_usb.c` `drivers/net/can/usb/peak_usb/pcan_usb_core.c` `drivers/net/can/usb/peak_usb/pcan_usb_pro.c`	+4 -0	1 reply

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.