usb: xhci: Set interrupt moderation for host mode to 4000(1ms)

Higher value allows xhci core to moderate interrupts resulting
in fewer interrupts from xhci core. This results in lower CPU
utilization during peak throughput scenarios.

Change-Id: I69548fd9a1adff1b8eafee40c0f92639efd93b2e
Signed-off-by: Devdutt Patnaik <dpatnaik@codeaurora.org>
Signed-off-by: Azhar Shaikh <azhars@codeaurora.org>