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

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>

(Upstream commit 6887cfa075349a8c16e72747408feeced7235ade).

Bug: 140266694
Change-Id: I12a368640d4ad89bd71012cb92fd6744d840dc04
Signed-off-by: Yabin Cui <yabinc@google.com>