coresight: Updates for v6.4

This is a relatively smaller update for CoreSight tracing subsystem targeting
v6.4, with the following changes:

  - Removing Mathieu Poirier as MAINTAINER for the subsystem, with updates to
    CREDITS for his contributions.
  - Fix CoreSight ETM PMU to set the module field

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
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