usb: dwc3-omap: Fix missing break in dwc3_omap_set_mailbox()

usb: dwc3-omap: Fix missing break in dwc3_omap_set_mailbox()

commit 0913750f9fb6f26bcd00c8f9dd9a8d1b8d031246 upstream.

We need to break from all cases if we want to treat
each one of them separately.

Reported-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Fixes: d2728fb3e01f ("usb: dwc3: omap: Pass VBUS and ID events transparently")
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>