UPSTREAM: coresight: tmc-etr: Disallow perf mode

We don't support ETR in perf mode yet. So, don't
even try to enable the hardware, even by mistake.

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 ef32df53b73bd29d5bfa4af4fda287baa6dc6544).

Bug: 140266694
Change-Id: Ie30284a724855c198fe22e0157481124fe6e9f01
Signed-off-by: Yabin Cui <yabinc@google.com>