usb: xhci-mtk: enable wake-up interrupt after runtime_suspend called

Use new function dev_pm_set_dedicated_wake_irq_reverse() to request
dedicated wake-up interrupt, due to we want to enable the wake IRQ
after running ->runtime_suspend().

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>