FROMGIT: dts: bindings: coresight: ETM system register access only units

Document the bindings for ETMs with system register accesses.

Link: https://lore.kernel.org/r/20210110224850.1880240-27-suzuki.poulose@arm.com


Cc: devicetree@vger.kernel.org
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-29-mathieu.poirier@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 61c68c68
https: //git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git next)
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Change-Id: I8f62b0c38d004112a1be5c37d59d3c88ee7b2649