ANDROID: arm64: dts: hi3660: Add support for usb on Hikey960

This patch adds support for usb on Hikey960.

Bug: 146450171
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: John Stultz <john.stultz@linaro.org>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I3325fbdaf6eea8cd1facb3d64bf0bf7f1c81fb23