dt-bindings: arm: coresight: Unify funnel DT binding

Following the same fashion with replicator DT binding, this patch is to
unify the DT binding for funnel to support static and dynamic modes;
finally we get the funnel DT binding as below:

Before patch:

  Static funnel, aka. non-configurable funnel:
    Not supported;

  Dynamic funnel, aka. configurable funnel:
    "arm,coresight-funnel", "arm,primecell";

After patch:

  Static funnel:
    "arm,coresight-static-funnel";

  Dynamic funnel:
    "arm,coresight-dynamic-funnel", "arm,primecell";
    "arm,coresight-funnel", "arm,primecell"; (obsolete)

At the end of this patch, it gives an example for static funnel DT
binding, and updates the dynamic funnel example.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Wanglai Shi <shiwanglai@hisilicon.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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