UPSTREAM: coresight: tmc-etr: Handle memory errors

We have so far ignored the memory errors, assuming that we have perfect
hardware and driver. Let us handle the memory errors reported by the
TMC ETR in status and truncate the buffer.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[Removed ASCII smiley face from changelog]
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20190829202842.580-6-mathieu.poirier@linaro.org


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

(Upstream commit f52ff9b7d64953b9a1a03faaf797d23b5c1d10d0).

Bug: 140266694
Change-Id: I04cbc55cb4b916f877ff25ab292e3b1ebb396333
Signed-off-by: Yabin Cui <yabinc@google.com>