coresight: etm4x: add tracer ID for A72 Maia processor.

This patch adds a cellID for the ETMv4 tracer found on
HiSillicon's A72 Maia processor.

Signed-off-by: Li Pengcheng <lipengcheng8@huawei.com>
Signed-off-by: Li Zhong <lizhong11@hisilicon.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>