arm64: dts: hi3660: Add CoreSight support

This patch adds DT bindings for the CoreSight trace components
on hi3660, which is used by 96boards Hikey960.

Signed-off-by: Wanglai Shi <shiwanglai@hisilicon.com>
Reviewed-and-tested-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>