coresight: Disable source helpers in coresight_disable_path()

coresight_enable_path() enables helpers attached to every device in
the path, including those bound to the source. However,
coresight_disable_path() skips the source node, so source helpers had
to be disabled separately in coresight_disable_source().

Move source helper disabling into coresight_disable_path() instead.
Make coresight_disable_path_from() start from the passed node nd, so
it can also disable helpers on the source. Update the comments
accordingly.

As coresight_disable_path_from() now changes its semantics from
"start beyond nd" to "start from nd", update the failure handling in
coresight_enable_path(). If enabling a node fails, iterate to the
previous node (the last successfully enabled one) and pass it to
coresight_disable_path_from() for rollback.

Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-15-f88c4a3ecfe9@arm.com

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