coresight: of: Use of_cpu_node_to_id helper

Reuse the new generic helper, of_cpu_node_to_id() to map a
given CPU phandle to a logical CPU number.

Change-Id: I8ddf46a6ebcd84813759184b9f2df78a769a90a0
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 29198e3844caaaacb0e21eff634c5f1cfd7f89be
[rananta@codeaurora.org: resolved trivial merge conflicts]
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>