usb: dwc2: controller must update lx_state before releasing lock

During suspend, there could a race condition between ep_queue and
suspend interrupt if lx_state is updated after releasing spinlock in
call_gadget(hsotg, suspend).

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>