coresight: etm4x: Handle ETM architecture version

mainline inclusion
from mainline-v5.11-rc5
commit e49516e2
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5YCYK
CVE: NA

Reference: https://lore.kernel.org/r/20210110224850.1880240-18-suzuki.poulose@arm.com

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We are about to rely on TRCDEVARCH for detecting the ETM
and its architecture version, falling back to TRCIDR1 if
the former is not implemented (in older broken implementations).

Also, we use the architecture version information to
make some decisions. Streamline the architecture version
handling by adding helpers.

Link: https://lore.kernel.org/r/20210110224850.1880240-18-suzuki.poulose@arm.com


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/20210201181351.1475223-20-mathieu.poirier@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>