usb: hsic_hcd: add remote wakeup support

With remote wakeup, usb peripheral can wakeup usb host using
resume signalling when usb bus is suspended. During XO shutdown
remote wakeup is over strobe line which is wakeup capable.
Register for strobe wakeup gpio while suspending usb hsic
controller to support remote wakeup.

Change-Id: Ia8b4d5371dbd0bdbbc86a77cc6236ae9b562a3f2
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>