MAINTAINERS: Add CoreSight mailing list

Add CoreSight mailing list so that people can participate in patch
reviews and know what features are coming next.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200916191737.4001561-13-mathieu.poirier@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -1746,6 +1746,7 @@ ARM/CORESIGHT FRAMEWORK AND DRIVERS
 M:	Mathieu Poirier <mathieu.poirier@linaro.org>
 R:	Suzuki K Poulose <suzuki.poulose@arm.com>
 R:	Mike Leach <mike.leach@linaro.org>
+L:	coresight@lists.linaro.org (moderated for non-subscribers)
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-bus-coresight-devices-*