usb: gadget: CDC ACM: call usb_gadget_initialize

To actually use the gadget the peripheral driver must be probed and we
must call g_dnl_clear_detach(). Otherwise acm_stdio_start() will always
fail to find a UDC on DT platforms.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
1 file changed