UPSTREAM: coresight: etm4x: Add support for handling errors

Add support for handling errors in enabling the component.
The ETM is enabled via cross call to owner CPU. Make
necessary changes to report the error back from the cross
call.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(Upstream commit e006d89abedd5d04e6033c5614e1bf160b252615).

Bug: 140266694
Change-Id: I2ddad5992aca58d9b019218b07680d7c36ccfab3
Signed-off-by: Yabin Cui <yabinc@google.com>