UPSTREAM: coresight: Use coresight device names for sinks in PMU attribute

(Upstream commit 6887cfa075349a8c16e72747408feeced7235ade).

Move to using the coresight device name instead of the parent
device name for SINK attribute for PMU.

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

Bug: 140266694
Change-Id: Ied117c17cd4ef9f0ebe6826689e73d2479a2cab0
Signed-off-by: Yabin Cui <yabinc@google.com>